Do not abort when volume already exists

Author: fiveop

group_composition_plot/create_volume.sh

@@ -1,6 +1,5 @@
 if [ -f submissions.volume ]; then
     echo "submissions.volume already exists"
-    exit 1
 else
     dd if=/dev/zero of=submissions.volume bs=1024 count=10240
     mkfs.ext4 submissions.volume