Bump version to 0.5.8.1, ignore VCards without VEVENTs (fixes #178)

AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="at.bitfire.davdroid"
-    android:versionCode="28"
-    android:versionName="0.5.8" android:installLocation="internalOnly">
+    android:versionCode="29"
+    android:versionName="0.5.8.1" android:installLocation="internalOnly">
 
     <uses-sdk
         android:minSdkVersion="14"

src/at/bitfire/davdroid/Constants.java

@@ -12,7 +12,7 @@ package at.bitfire.davdroid;
 
 public class Constants {
 	public static final String
-		APP_VERSION = "0.5.8-alpha",
+		APP_VERSION = "0.5.8.1-alpha",
 		
 		ACCOUNT_TYPE = "bitfire.at.davdroid",
 		

src/at/bitfire/davdroid/resource/Event.java

@@ -137,7 +137,7 @@ public class Event extends Resource {
 		// event
 		ComponentList events = ical.getComponents(Component.VEVENT);
 		if (events == null || events.isEmpty())
-			return;
+			throw new InvalidResourceException("No VEVENT found");
 		VEvent event = (VEvent)events.get(0);
 		
 		if (event.getUid() != null)