trac error adding comment to #394

Greets,

Just tried to add a comment to trac ticket 394.  Resulted in error:

Trac detected an internal error:
AttributeError: 'NoneType' object has no attribute 'split'

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My comment, for posterity, was:

You may want to seriously consider pushing this patch into trunk since the
performance benefit is, well, significant.

My phrase test:  from 15s+ down to 1s

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regards
Henry