create: path.version may be nil

Fixes https://github.com/Homebrew/homebrew-core/issues/3067.

Library/Homebrew/cmd/create.rb

@@ -110,8 +110,7 @@ class FormulaCreator
       when %r{github\.com/\S+/(\S+)/archive/}
         @name = $1
       else
-        /(.*?)[-_.]?#{Regexp.escape(path.version)}/.match path.basename
-        @name = $1
+        @name = path.basename.to_s[/(.*?)[-_.]?#{Regexp.escape(path.version.to_s)}/, 1]
       end
     end
     update_path