prevent future errors

Rule34/gallery-dl.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/bash
 
+[[ -f downloaded_r34.txt ]] || echo "no file to download from" || exit 1
 cp downloaded_r34.txt to_download_r34.txt
 
 while [ 1 ]
@@ -9,6 +10,7 @@ do
     if [ ! -s to_download_r34.txt ]; then
         #success! just exit
         echo "file empty"
+        rm to_download_r34.txt
         exit 0
     fi
     echo "file not empty"