No handlers could be found for logger "ho.pisa"

[Sebuz]

Trac log handler is not passed to Pisa resulting in error messages (Apache error log):

No handlers could be found for logger "ho.pisa"

TracWikiPrintPlugin 1.9.2
pisa 3.0.33
Trac 0.12

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Possible fix that worked for me:

Pass the log handler to Pisa before line 260 in wikiprint.py:

 pisa.log.addHandler(self.env._log_handler)
 pdf = pisa.CreatePDF(page, pdf_file, show_errors_as_pdf = True, default_css = css_data, link_callback = loader.getFileName)
 out = pdf_file.getvalue()
 pdf_file.close()
 pisa.log.removeHandler(self.env._log_handler)

Remove handler when done.

[Álvaro Iradier]

Sounds like a good fix, and logging Pisa messages would be useful too. I'll try it and include the proposed patch.