fix warning reg. unused variable

introduced in a2c0bf6188
Add Balalaika Family to Instrument List

A response to this thread http://musescore.org/en/node/27581 but the
balalaika family was also asked for in 2012:
http://musescore.org/en/node/15908. A little digging this morning
enabled me to find the requisite string data. Not sure I have the clefs
correct though these are pure speculation in the absence of information
from the web
Merge pull request #1038 from ChurchOrganist/Add-Balalaika

Add Balalaika Family to Instrument List
Merge pull request #1037 from Jojo-Schmitz/warnings

fix warning reg. unused variable
Fix #22128 - Handled failing slur case (issue comment #5) and did a little refactoring on related code
Fix Balalaika Definition

Some errors crept into the Balalaika definition added yesterday. This is
the fix for them. I have also made a better guess at clef information
although this is still not guaranteed correct
Merge pull request #1041 from ChurchOrganist/FixBalalaika

Fix Balalaika Definition
Merge pull request #1040 from jpirie/22128-slurs

Handles final slur case in GP4/GP5 files.
fix #24212: Stemless notes draw stems when beamed with stemmed notes