When retrieving MMS, continue on with best-effort in absence of APNs.

src/org/thoughtcrime/securesms/mms/MmsDownloadHelper.java

@@ -50,14 +50,16 @@ public class MmsDownloadHelper extends MmsCommunication {
   }
 
   public static byte[] retrieveMms(Context context, String url, String apn) throws IOException {
+    MmsConnectionParameters connectionParameters;
+
     try {
-      MmsConnectionParameters connectionParameters = getMmsConnectionParameters(context, apn);
+      connectionParameters = getMmsConnectionParameters(context, apn);
+    } catch (MmsException me) {
+      Log.w("MmsDownloadHelper", me);
+      connectionParameters = new MmsConnectionParameters(null, null, null);
+    }
 
     checkRouteToHost(context, connectionParameters, url);
     return makeRequest(connectionParameters, url);
-    } catch (MmsException me) {
-      Log.w("MmsDownloader", me);
-      throw new IOException("Problem configuring MmsConnectionParameters.");
-    }
   }
 }