Empty python comment gives problems

In case we have an empty python comment like: `"""""""` (i.e. 6 double quotes) doxygen will crash in the pyscanner.l  version of `stripIndentation`.
```
class Translator(nodes.NodeVisitor):
    """"""

    ## the var
    words_and_spaces = re.compile(r'\S+| +|\n')
```
In case of an empty comment we should not call `stripIndentation` and not place `\verbatim` / `\endverbatim` around the empty comment (the later would give an non-understandable empty comment block).
An empty comment should be handled as no comment.

Found by Fossies whilst generating documentation for Mercural 5.5).

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