Fix type error class_methods.py

This line currently causes my gdb sessions to error out with:

  TypeError: unorderable types: list() > int()

Looks like this just wants to check for an empty list

Bug: None
Change-Id: I5de214c2373045a320e83db229b2ae449b78c967
Reviewed-on: https://chromium-review.googlesource.com/c/1352645Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611488}

tools/gdb/util/class_methods.py

@@ -88,7 +88,7 @@ def Class(class_name, template_types):
       # Constructs a regular expression to match this type.
       self._class_regex = re.compile(
           '^' + re.escape(class_name) +
-          ('<.*>' if template_types > 0 else '') + '$')
+          ('<.*>' if len(template_types) > 0 else '') + '$')
 
       # Construct a dictionary and array of methods
       self.dict = {}