Improvement of content assistant

Eliminating NullPointerException when putting a dot after a number
Signed-off-by: Adam Knapp <adam.knapp@ericsson.com>

org.eclipse.titan.designer/src/org/eclipse/titan/designer/editors/ttcn3editor/ContentAssistProcessor.java

@@ -139,8 +139,11 @@ public final class ContentAssistProcessor implements IContentAssistProcessor {
 		
 		final CompilationTimeStamp timestamp = tempModule.getLastCompilationTimeStamp();
 		
-		if (ref != null ) {
+		if (ref != null) {
 			Assignment assignment = scope.getAssBySRef(timestamp, ref);
+			if (assignment == null) {
+				return null;
+			}
 			IType type = assignment.getType(timestamp);
 			if (type != null) {
 				if (ref.getSubreferences().size() > 1) {
@@ -299,6 +302,9 @@ public final class ContentAssistProcessor implements IContentAssistProcessor {
 						final IType fieldType = ct.getFieldType(timestamp, ref, 1, Expected_Value_type.EXPECTED_DYNAMIC_VALUE, null, false);
 						if (fieldType instanceof Class_Type) {
 							ct = (Class_Type)fieldType;
+							if (ct.getClassBody() == null) {
+								return;
+							}
 							for (Map.Entry<String, Definition> entry : ct.getClassBody().getDefinitionMap().entrySet()) {
 								final Definition d = entry.getValue();
 								final String memberName = d.getIdentifier().getDisplayName();