Fix error message displayed when an error occurs during argument parsing

Author: gnodet

maven-cli/src/main/java/org/apache/maven/cling/invoker/mvn/DefaultMavenParser.java

@@ -51,7 +51,7 @@ protected MavenOptions parseArgs(String source, List<String> args) throws Parser
         try {
             return CommonsCliMavenOptions.parse(source, args.toArray(new String[0]));
         } catch (ParseException e) {
-            throw new ParserException("Failed to parse source " + source, e.getCause());
+            throw new ParserException("Failed to parse source " + source + ": " + e.getMessage(), e.getCause());
         }
     }