android only update AndroidManifest if versionCode not empty

.travis.yml

@@ -65,7 +65,7 @@ cache:
 
 
 before_install:
-  - cd ${TRAVIS_BUILD_DIR} && git fetch --unshallow && git fetch --tags
+  - cd ${TRAVIS_BUILD_DIR} && git fetch --unshallow && git fetch --all --tags
   - if [ "${TRAVIS_OS_NAME}" = "linux" ]; then mkdir -p ~/.config/QtProject/ && cp ${TRAVIS_BUILD_DIR}/test/qtlogging.ini ~/.config/QtProject/; fi
   - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then mkdir -p ~/Library/Preferences/QtProject/ && cp ${TRAVIS_BUILD_DIR}/test/qtlogging.ini ~/Library/Preferences/QtProject/; fi
   - if [ "${TRAVIS_OS_NAME}" = "android" ]; then wget https://s3-us-west-2.amazonaws.com/qgroundcontrol/dependencies/gstreamer-1.0-android-armv7-1.5.2.tar.bz2 && mkdir -p ${TRAVIS_BUILD_DIR}/gstreamer-1.0-android-armv7-1.5.2 && tar jxf gstreamer-1.0-android-armv7-1.5.2.tar.bz2 -C ${TRAVIS_BUILD_DIR}/gstreamer-1.0-android-armv7-1.5.2; fi

tools/update_android_version.sh

@@ -8,5 +8,14 @@ VERSIONNAME=`git describe --always --tags | sed -e 's/^v//'`
 echo "VersionCode: ${VERSIONCODE}"
 echo "VersionName: ${VERSIONNAME}"
 
-sed -i -e "s/android:versionCode=\"[0-9][0-9]*\"/android:versionCode=\"${VERSIONCODE}\"/" $MANIFEST_FILE
-sed -i -e 's/versionName *= *"[^"]*"/versionName="'$VERSIONNAME'"/' $MANIFEST_FILE
+if [ -n "$VERSIONCODE" ]; then
+	sed -i -e "s/android:versionCode=\"[0-9][0-9]*\"/android:versionCode=\"$VERSIONCODE\"/" $MANIFEST_FILE
+else
+	echo "Error versionCode empty"
+fi
+
+if [ -n "$VERSIONNAME" ]; then
+	sed -i -e 's/versionName *= *"[^"]*"/versionName="'$VERSIONNAME'"/' $MANIFEST_FILE
+else
+	echo "Error versionName empty"
+fi