I've told the emulator plugin to not show a window, yet it doesn't pass -no-window to the emulator when listing snapshots. If I run this from the command line on my Jenkins slave, I get the same error. If I pass -no-window, it lists the single snapshot.

From the log file:

[android] Creating Android AVD: /home/ubuntu/.android/avd/hudson_en-US_240_WVGA_android-7.avd
$ /home/ubuntu/android/tools/emulator -snapshot-list -avd hudson_en-US_240_WVGA_android-7
SDL init failure, reason is: No available video device