Do not throw when attempting to parse URLs

Author: Wliu

lib/github-file.js

@@ -272,7 +272,9 @@ export default class GitHubFile {
       const {host} = parseURL(url)
 
       return host === 'gist.github.com'
-    } finally {}
+    } catch (error) {
+      return false
+    }
   }
 
   isGitHubWikiURL (url) {
@@ -288,7 +290,9 @@ export default class GitHubFile {
       const {host} = parseURL(url)
 
       return host === 'bitbucket.org'
-    } finally {}
+    } catch (error) {
+      return false
+    }
   }
 
   // Internal