fix: address warnings on kernel initialized dispatch (#205)

* fix: autorouting should pick up modules that only define routes

Instead of having a Page component, we should also just allow a user
to define a set of routes.
This is what we need for the /apps/scrolling example.

* fix: hot reload was too aggresive (#179)

* test: enable reload tests

* fix: do not reload modules that are not under the app directory

Fixes #177
Fixes #148

* clean up code

* __file__ can be None

* call clear from the test code

* move to subdir so we do not reload the test modules

* also catch AttributeError when app is None during unitesting

* fix: solara patches should have no effect outside a solara context

* pass cls

* fix: ignore typing

* pass cls

* fix: ignore typing

---------

Co-authored-by: Maarten A. Breddels <[email protected]>

solara/server/patch.py

@@ -74,34 +74,38 @@ def set_custom_exc(self, exc_tuple, handler):
         pass
 
 
-kernel_instance_dispatch_initial = ipykernel.kernelbase.Kernel.instance.__func__
+Kernel_instance_original = ipykernel.kernelbase.Kernel.instance.__func__  # type: ignore
 
 
 def kernel_instance_dispatch(cls, *args, **kwargs):
-    if not app.has_current_context():
-        return kernel_instance_dispatch_initial(cls, *args, **kwargs)
-    else:
+    if app.has_current_context():
         context = app.get_current_context()
         return context.kernel
+    else:
+        return Kernel_instance_original(cls, *args, **kwargs)
+
+
+Kernel_initialized_initial = ipykernel.kernelbase.Kernel.initialized.__func__  # type: ignore
 
 
-InteractiveShell_instance_initial = InteractiveShell.instance
+def kernel_initialized_dispatch(cls):
+    if app is None:  # python is shutting down, and the comm dtor wants to send a close message
+        return False
+    if app.has_current_context():
+        return True
+    else:
+        return Kernel_initialized_initial(cls)
+
+
+InteractiveShell_instance_initial = InteractiveShell.instance.__func__  # type: ignore
 
 
 def interactive_shell_instance_dispatch(cls, *args, **kwargs):
     if app.has_current_context():
         context = app.get_current_context()
         return context.kernel.shell
     else:
-        return InteractiveShell_instance_initial(*args, **kwargs)
-
-
-def kernel_initialized_dispatch(cls):
-    try:
-        app.get_current_context()
-    except RuntimeError:
-        return False
-    return True
+        return InteractiveShell_instance_initial(cls, *args, **kwargs)
 
 
 def display_solara(