🐛 Defensive null check (#424)

- **:recycle: provide messageText to all RuleSarifFactory impls**
- **Bind AppScan sarif to rule by rule name from message text**
- **:bug: fix distinct rule ID bug**
- **:bug: defensive null check**

framework/codemodder-base/src/main/java/io/codemodder/DefaultSarifParser.java

@@ -64,7 +64,8 @@ private RuleDescriptor extractRuleId(final Result result, final Run run) {
         return null;
       }
     }
-    return new RuleDescriptor(result.getRuleId(), result.getMessage().getText());
+    return new RuleDescriptor(
+        result.getRuleId(), result.getMessage() != null ? result.getMessage().getText() : null);
   }
 
   private Stream<Map.Entry<String, RuleSarif>> fromSarif(