check if handler exist before using it

[Phil Davis]

Thierry wrote:
> Hi Phil,
>
> Excellent !
>
> For my own interest, is this written somewhere in the Doc ?

Actually, it is! (To my own surprise - I just did a search). It's 
explained in the "errorDialog" page of the Rev dictionary.

Phil

>
> So, slowly may be I could manage what I want :-)
>
> Thanks to all of you for your time !
>
> Regards,
> Thierry
>
>> Those numbers follow the pattern Revolution uses to describe an error 
>> it encountered. If that is the case, then one of the numbers in each 
>> line is the line number of an error description in the cErrorsList of 
>> cd 1 of stack "revErrorDisplay". The other numbers are the line 
>> number of the bad line within the problem script, and char number 
>> where the bad reference starts within the problem line of code.
>>
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