enhance process_images script with more helpful checks and errors

website/scripts/process_images.sh

@@ -9,8 +9,25 @@ fi
 # Directory containing images
 IMAGE_DIR="$1"
 
+# Check if the directory exists
+if [ ! -d "$IMAGE_DIR" ]; then
+    echo "Error: Directory '$IMAGE_DIR' does not exist."
+    exit 1
+fi
+
+# Enable nullglob to avoid errors when no .jpg files are found
+shopt -s nullglob
+
+# Count the number of jpg files
+jpg_files=("$IMAGE_DIR"/*.jpg)
+
+if [ ${#jpg_files[@]} -eq 0 ]; then
+    echo "No JPG files found in '$IMAGE_DIR'."
+    exit 0
+fi
+
 # Loop over all jpg files in the directory
-for img in "$IMAGE_DIR"/*.jpg; do
+for img in "${jpg_files[@]}"; do
     # Extract the filename without extension
     filename=$(basename "$img" .jpg)