Fix changing values from source element parameter editor (only setting the initial value worked).

refs 2950,2562

org.fortiss.tooling.base/trunk/src/org/fortiss/tooling/base/annotation/valueprovider/.ratings

 AnnotationInstSpec.java 3b4dc57e844b75a549ef68acd327613a259dad80 RED
 DerivedAnnotationValueProviderBase.java ae12ab7e386cc53a6a66dfc331ba43549b864b93 YELLOW
 EStructuralFeatureDescriptor.java b4093c8997472d0ab63a69c1d025d9aeb9b4f294 GREEN
-EStructuralFeatureValueProviderBase.java 5634d4f0fea682bddb5a93234963278784a06691 YELLOW
+EStructuralFeatureValueProviderBase.java eb50feb4f0d1dd4b1dea9c489b84d1e9d240460f YELLOW
 IAnnotationValueProvider.java 2d7b8ceff3ed83e7b5d2973bfa0632b9ff501d92 YELLOW
-ValueProviderBase.java 3138017b6c19933551b5e46033107df5ad954352 YELLOW
+ValueProviderBase.java e577cc1cfffbad8ef47681f2dcdb2622f6be209e YELLOW

org.fortiss.tooling.base/trunk/src/org/fortiss/tooling/base/annotation/valueprovider/EStructuralFeatureValueProviderBase.java

@@ -151,7 +151,12 @@ public abstract class EStructuralFeatureValueProviderBase<T extends IAnnotatedSp
 		if(structuralFeature instanceof EAttribute) {
 			EFactory eFactory = getEFactory(structuralFeature);
 			EDataType eAttributeType = ((EAttribute)structuralFeature).getEAttributeType();
-			specification.eSet(structuralFeature, eFactory.createFromString(eAttributeType, value));
+			try {
+				specification.eSet(structuralFeature,
+						eFactory.createFromString(eAttributeType, value));
+			} catch(Exception e) {
+				specification.eSet(structuralFeature, null);
+			}
 		} else {
 			throw new Exception(
 					"setAnnotationValueFromString() is only availabe for EAttributes. Use setAnnotationValue(U value, T specification) instead.");