Made docbuild errors easier to debug + fixed error from changed exception class (ManimCommunity#3229)

* Make errors during docbuild somewhat easier to debug

* fix an issue with docbuild under py3.10+

Author: behackl

manim/utils/docbuild/manim_directive.py

@@ -272,10 +272,13 @@ def run(self):
             f"{clsname}().render()",
         ]
 
-        with tempconfig(example_config):
-            run_time = timeit(lambda: exec("\n".join(code), globals()), number=1)
-            video_dir = config.get_dir("video_dir")
-            images_dir = config.get_dir("images_dir")
+        try:
+            with tempconfig(example_config):
+                run_time = timeit(lambda: exec("\n".join(code), globals()), number=1)
+                video_dir = config.get_dir("video_dir")
+                images_dir = config.get_dir("images_dir")
+        except Exception as e:
+            raise RuntimeError(f"Error while rendering example {clsname}") from e
 
         _write_rendering_stats(
             clsname,

manim/utils/hashing.py

@@ -207,7 +207,7 @@ def default(self, obj: Any):
                     del cvardict[i]
             try:
                 code = inspect.getsource(obj)
-            except OSError:
+            except (OSError, TypeError):
                 # This happens when rendering videos included in the documentation
                 # within doctests and should be replaced by a solution avoiding
                 # hash collision (due to the same, empty, code strings) at some point.