fix regression in 0.9.5 server error when using filter with dot in name and custom applier

[senid231]

fixes #1214

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[lgebhardt]

@senid231 Thanks! I merged this with one minor change. Using try instead of &. to maintain compatibility with ruby versions earlier than 2.3. We don't officially support them, but I didn't want to lock someone out of the next 0.9 release.

[senid231]

@lgebhardt thanks