Checking file existence using 'if' replaced with shell option 'nullglob' to prevent the following 'for' loop from being entered even when no matching files are present.

tools/ssl_cleanup

@@ -3,8 +3,8 @@
 
 source /etc/mailinabox.conf
 shopt -s extglob
+shopt -s nullglob
 
-if ls "$STORAGE_ROOT/ssl/"*-+([0-9])-+([0-9a-f]).pem &>/dev/null; then
 retain_after="$(date --date="7 days ago" +%Y%m%d)"
 
 mkdir -p $STORAGE_ROOT/ssl.expired
@@ -16,4 +16,3 @@ if ls "$STORAGE_ROOT/ssl/"*-+([0-9])-+([0-9a-f]).pem &>/dev/null; then
     mv "$file" "$STORAGE_ROOT/ssl.expired/${pem}"
   fi
 done
-fi