fixes #411 [Lidarr] Fix BeetsTagger broken pipe: find | read → find | grep -q .

[barrettclark]

Summary

• Fixes find "$1" -type f -iname "*.flac" | read in BeetsTagger.bash line 49
• read closes the pipe after the first line, sending SIGPIPE to find and producing log errors on every BeetsTagger run
• Replaced with grep -q . which exits 0 if any output exists without closing the pipe early

Test plan

• BeetsTagger runs without find: 'standard output': Broken pipe / find: write error log errors
• Albums with FLAC files are still processed normally
• Albums without FLAC files still log the "Only supports flac files" error and return

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