JellyException.getMessage() shouldn't show pointless "null:-1:-1:<null>" in the 
error message
---------------------------------------------------------------------------------------------

                 Key: JELLY-233
                 URL: http://issues.apache.org/jira/browse/JELLY-233
             Project: Commons Jelly
          Issue Type: Improvement
          Components: core / taglib.core
    Affects Versions: 1.1
            Reporter: Kohsuke Kawaguchi


JellyExceptions are often created without supplying location information. A 
little change to the JellyException.getMessage() can improve the readability of 
the error message, as follows:

    public String getMessage() {
        if(fileName==null && lineNumber==-1 && columnNumber==-1 && 
elementName==null)
            return getReason();
        else
            return fileName + ":" + lineNumber + ":" + columnNumber + ": <" + 
elementName + "> " + getReason();
    }


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