don't instrument phantom classes

Author: StevenArzt

soot-infoflow-android/src/soot/jimple/infoflow/android/entryPointCreators/components/AbstractComponentEntryPointCreator.java

@@ -256,7 +256,7 @@ protected void instrumentDummyMainMethod() {
 	 * Code adapted from FlowDroid v2.0.
 	 */
 	public void assignIntent(SootClass hostComponent, SootMethod method, int indexOfArgs) {
-		if (!method.isStatic()) {
+		if (method.isConcrete() && !method.isStatic()) {
 			JimpleBody body = (JimpleBody) method.retrieveActiveBody();
 
 			// Some component types such as fragments don't have a getIntent() method