Remove empty attachments from Markdown cell (#27)

Author: hoxbro

src/clean_notebook/clean.py

@@ -49,6 +49,9 @@ def clean_single_notebook(
         if not cell["source"] and not keep_empty:
             nb["cells"].remove(cell)
             cleaned = True
+        if "attachments" in cell and len(cell["attachments"]) == 0:
+            del cell["attachments"]
+            cleaned = True
 
     if not nb["cells"]:
         print(f"Notebook '{file}' does not have any valid cells.")

tests/data/clean_vscode.ipynb

@@ -19,6 +19,13 @@
    "source": [
     "print(\"saved from vscode\")"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Markdown"
+   ]
   }
  ],
  "metadata": {

tests/data/dirty_vscode.ipynb

@@ -30,6 +30,14 @@
    "source": [
     "print(\"saved from vscode\")"
    ]
+  },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Markdown"
+   ]
   }
  ],
  "metadata": {