func_timer cleanup TypeError

Added code to cleanup function in func_timer.py module to tolerate TypeError on
lprint_executing call.

This should help to eliminate errors such as this:

Exception TypeError: "'NoneType' object is not callable" in <bound method
func_timer_class.__del__ of <func_timer.func_timer_class instance at
0x7f888c143560>> ignored

Change-Id: I5c13c72bdf6c344a19c12b2fd7459210c6a861e0
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/lib/func_timer.py b/lib/func_timer.py
index 5f83241..d07ba32 100644
--- a/lib/func_timer.py
+++ b/lib/func_timer.py
@@ -86,11 +86,13 @@
         try:
             gp.lprint_executing()
             gp.lprint_var(self.__child_pid)
-        except (AttributeError, KeyError):
+        except (AttributeError, KeyError, TypeError):
             # NOTE: In python 3, this code fails with "KeyError:
             # ('__main__',)" when calling functions like lprint_executing that
             # use inspect.stack() during object destruction.  No fixes found
-            # so tolerating the error.
+            # so tolerating the error.  In python 2.x, it may fail with
+            # TypeError.  This seems to happen when cleaning up after an
+            # exception was raised.
             pass
 
         # If self.__child_pid is 0, then we are either running as the child