fix for an issue with empty math block

jupyter · Jan 9, 2018 · 4f23786 · 4f23786
1 parent 8984d4d
commit 4f23786
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/nbconvert/exporters/tests/files/notebook2.ipynb b/nbconvert/exporters/tests/files/notebook2.ipynb
@@ -172,6 +172,13 @@
     "\n",
     "one *test* two *tests*. three *tests*"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Make sure markdown parser doesn't crash with empty Latex formulas blocks\n$$$$\n$$"
+   ]
   }
  ],
  "metadata": {

diff --git a/nbconvert/filters/markdown_mistune.py b/nbconvert/filters/markdown_mistune.py
@@ -85,7 +85,7 @@ def output_inline_math(self, m):
         return self.renderer.inline_math(m.group(1) or m.group(2))
 
     def output_block_math(self, m):
-        return self.renderer.block_math(m.group(1) or m.group(2))
+        return self.renderer.block_math(m.group(1) or m.group(2) or "")
 
     def output_latex_environment(self, m):
         return self.renderer.latex_environment(m.group(1),