Add null check for CodeShield demo notebook

Reviewed By: csahana95

Differential Revision: D68748939

fbshipit-source-id: 810dc3ee87c9c1eee14eaf573a8e689dae338365

CodeShield/notebook/CodeShieldUsageDemo.ipynb

@@ -62,7 +62,7 @@
         "    print(\"\\t Recommended treatment: %s\\n\" % result.recommended_treatment)\n",
         "\n",
         "    print (\"## Details:\\n\")\n",
-        "    if len(result.issues_found) > 0:\n",
+        "    if result.issues_found is not None and len(result.issues_found) > 0:\n",
         "        issue = result.issues_found[0]\n",
         "        print (\"\\tIssue found: \\n\\t\\tPattern id: %s \\n\\t\\tDescription: %s \\n\\t\\tSeverity: %s \\n\\t\\tLine number: %s\" % (issue.pattern_id, issue.description, issue.severity, issue.line))\n",
         "        \n",