Update various scripts

scripts/shell/gdl.sh

@@ -1,5 +1,18 @@
 #!/bin/bash
 
-gallery-dl $1
+media_url=$1
+
+gallery-dl $media_url
+cmd_exit_code=$?
+
+if [[ $cmd_exit_code -ne 0 ]]; then
+    printf "\n"
+
+    echo "[ERROR] `basename $0`: Could not download url \"$media_url\""
+    echo "[ERROR] Exit status: $cmd_exit_code"
+
+    exit 1
+fi
+
 find gallery-dl -type f -exec mv '{}' . \;
 rm --recursive gallery-dl