Crash fix on ada import.

CCBUG:333363
FIXED-IN:4.13.0
(cherry picked from commit 3094593e)

umbrello/codeimport/adaimport.cpp

@@ -616,8 +616,10 @@ bool AdaImport::parseStmt()
     }
     UMLObject *o = Import_Utils::insertAttribute(m_klass, m_currentAccess, name,
                                                  typeName, m_comment);
-    UMLAttribute *attr = static_cast<UMLAttribute*>(o);
-    attr->setInitialValue(initialValue);
+    if (o) {
+	UMLAttribute *attr = static_cast<UMLAttribute*>(o);
+	attr->setInitialValue(initialValue);
+    }
     skipStmt();
     return true;
 }