Assuming that we have a GPS provider until we're told otherwise

(this avoid a startup toast saying we have no GPS).

MyTracks/src/com/google/android/apps/mytracks/content/TrackDataHub.java

@@ -170,7 +170,7 @@ public class TrackDataHub {
 
   // Cached GPS readings
   private Location lastSeenLocation;
-  private boolean hasProviderEnabled;
+  private boolean hasProviderEnabled = true;
   private boolean hasFix;
   private boolean hasGoodFix;