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Fix segfault on wrong nssdir

Tobias Deiminger requested to merge haxtibal/poppler:bugfix/pdfsig_crash_wrong_db into master

If SignatureHandler was used with a custom DB directory, but that directory didn't exist or contained no valid DB, NSS crashed on subsequent calls.

We can prevent crashes by calling NSS_NoDB_Init (as it's already done in the default-DB case).

Fixes #1331 (closed).

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