make geocoding exception not breaking all rows

[stacquet]

Exceptions were not catched, so possibly, if 9 999 rows were geocoded but 1 fails, the SQL Query broke and all the rows were lost. Change is that the exception is return as text in the sql result

[unytics]

Thanks @stacquet for this PR.

I merge it and add an improvement over your suggestion:
-> return a json with an error message when there is an error instead of a plain text

[unytics]

Thanjs @stacquet, your fix is now updated and deployed. Here is the new function code.

Thanks a lot for your contribution