azdev statistics list-command-table: Handle exceptions when source code cannot be retrieved (#421)

* handle exception

* update changelog

* fix lint

Author: necusjz

HISTORY.rst

@@ -2,6 +2,11 @@
 
 Release History
 ===============
+
+0.1.60
+++++++
+* `azdev statistics list-command-table`: Handle exceptions when source code cannot be retrieved
+
 0.1.59
 ++++++
 * `azdev command-change meta-export`: Normalize basic cmd types: str, bool, int, float

azdev/__init__.py

@@ -4,4 +4,4 @@
 # license information.
 # -----------------------------------------------------------------------------
 
-__VERSION__ = '0.1.59'
+__VERSION__ = '0.1.60'

azdev/operations/statistics/__init__.py

@@ -336,7 +336,13 @@ def _get_module_functions(path):
 
 
 def _expand_all_functions(func, func_map):
-    source = textwrap.dedent(inspect.getsource(func))
+    source = ""
+    try:
+        source = textwrap.dedent(inspect.getsource(func))
+    except (OSError, TypeError):
+        # https://docs.python.org/3/library/inspect.html#inspect.getsource
+        logger.warning("Cannot retrieve the source code of %s.", func)
+
     if func_map is None:
         return source