pen: fix niggly problem with hatches

[Andrew de Quincey]

Just a fix for an annoying niggle; the current code checks if brush->lbHatch 
is nonnull. If it is, it assumes a hatch is being used, and prints a warning.

Some apps however (e.g. Xara X) have rubbish in the hatch part of the 
structure when a hatch is not actually being used. This triggers an 
unnecessary warning (_all_ the time in Xara X). 

This patch makes sure the warning only appears if a hatch is REALLY being used 
by testing the flags.
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