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Avoid strlen(NULL) crash on some txt-records #257

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@andhe andhe commented Jan 2, 2020

A record with only key= and empty value causes a crash, eg.
note=

http://bugs.debian.org/947891

A record with only key= and empty value causes a crash, eg.
<txt-record>note=</txt-record>

http://bugs.debian.org/947891
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andhe commented Jan 2, 2020

Of course I should have checked merge requests first.... This is the same problem as #255 (with cosmetic differences).

@lathiat lathiat closed this in 4a6d6cc Feb 12, 2020
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