GPX: on import ignore TrackPoints without time.

Previous behavior: abort import.

Fixes #2384.

src/androidTest/java/de/dennisguse/opentracks/io/file/importer/GPXTrackImporterTest.java

@@ -120,6 +120,47 @@ public class GPXTrackImporterTest {
         ), importedTrackPoints);
     }
 
+    @LargeTest
+    @Test
+    public void gpx_missing_time() throws IOException {
+        // given
+        XMLImporter importer = new XMLImporter(new GPXTrackImporter(context, trackImporter));
+        InputStream inputStream = InstrumentationRegistry.getInstrumentation().getContext().getResources().openRawResource(de.dennisguse.opentracks.test.R.raw.gpx11_missing_time);
+
+        // when
+        // 1. import
+        importTrackId = importer.importFile(inputStream).get(0);
+
+        // then
+        // 2. track
+        Track importedTrack = contentProviderUtils.getTrack(importTrackId);
+        assertNotNull(importedTrack);
+        assertEquals("", importedTrack.activityTypeLocalized());
+        assertEquals("", importedTrack.description());
+        assertEquals("20210907_213924.gpx", importedTrack.name());
+        assertEquals(ActivityType.UNKNOWN, importedTrack.activityType());
+
+        // 3. trackstatistics
+        Statistics trackStatistics = importedTrack.statistics();
+        assertEquals(0, trackStatistics.maxSpeed().toMPS(), 0.01);
+        assertEquals(Duration.ofSeconds(0), trackStatistics.movingDuration());
+
+        // 4. trackpoints
+        List<TrackPoint> importedTrackPoints = TestDataUtil.getTrackPoints(contentProviderUtils, importTrackId);
+        assertEquals(1, importedTrackPoints.size());
+
+        TrackPointAssert a = new TrackPointAssert();
+        a.assertEquals(List.of(
+                new TrackPoint(TrackPoint.Type.SEGMENT_START_AUTOMATIC,
+                        new Position(
+                                Instant.parse("2021-09-07T22:12:00Z"),
+                                30.14185982, -40.3863038, null,
+                                Altitude.WGS84.of(-5), null,
+                                null,
+                                null))
+        ), importedTrackPoints);
+    }
+
     @LargeTest
     @Test
     public void gpx_speed_no_namespace() throws IOException {

src/androidTest/res/raw/gpx11_missing_time.gpx

@@ -0,0 +1,22 @@
+<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
+<gpx version="1.1" creator="Cruiser" xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">
+  <trk>
+    <name>20210907_213924.gpx</name>
+    <trkseg>
+      <trkpt lat="30.14185982" lon="-40.3863038">
+        <ele>-5</ele>
+        <hdop>4</hdop>
+      </trkpt>
+      <trkpt lat="30.14184657" lon="-40.38670089">
+        <ele>-5</ele>
+        <time/>
+        <hdop>4</hdop>
+      </trkpt>
+      <trkpt lat="30.14185982" lon="-40.3863038">
+        <ele>-5</ele>
+        <time>2021-09-07T22:12:00Z</time>
+        <hdop>4</hdop>
+      </trkpt>
+    </trkseg>
+  </trk>
+</gpx>

src/main/java/de/dennisguse/opentracks/io/file/importer/GPXTrackImporter.java

@@ -18,8 +18,11 @@ package de.dennisguse.opentracks.io.file.importer;
 
 import android.content.Context;
 import android.net.Uri;
+import android.text.TextUtils;
 import android.util.Log;
 
+import androidx.annotation.Nullable;
+
 import org.xml.sax.Attributes;
 import org.xml.sax.Locator;
 import org.xml.sax.helpers.DefaultHandler;
@@ -178,7 +181,10 @@ public class GPXTrackImporter extends DefaultHandler implements XMLImporter.Trac
                 zoneOffset = null;
             }
             case TAG_TRACK_SEGMENT -> onTrackSegmentEnd();
-            case TAG_TRACK_POINT -> currentSegment.add(createTrackPoint());
+            case TAG_TRACK_POINT -> {
+                TrackPoint trackPoint = createTrackPoint();
+                if (trackPoint != null) currentSegment.add(trackPoint);
+            }
             case TAG_NAME -> {
                 if (content != null) {
                     name = content.trim();
@@ -284,8 +290,10 @@ public class GPXTrackImporter extends DefaultHandler implements XMLImporter.Trac
         currentSegment.clear();
     }
 
-
+    @Nullable
     private TrackPoint createTrackPoint() throws ParsingException {
+        if (TextUtils.isEmpty(time)) return null;
+
         OffsetDateTime parsedTime;
         try {
             parsedTime = StringUtils.parseTime(time);
@@ -468,7 +476,10 @@ public class GPXTrackImporter extends DefaultHandler implements XMLImporter.Trac
         }
 
         TrackPoint trackPoint = createTrackPoint();
-
+        if (trackPoint == null) {
+            Log.w(TAG, "Marker with no TrackPoint");
+            return;
+        }
         if (!trackPoint.position().hasLocation()) {
             Log.w(TAG, "Marker with invalid coordinates ignored: " + trackPoint.position());
             return;