fix text in LoadModule.

Author: mmatera

mathics/builtin/assignment.py

@@ -1751,7 +1751,7 @@ class LoadModule(Builtin):
      : Python module nomodule does not exist.
      = $Failed
     >> LoadModule["sys"]
-     : Python module sys does not exist.
+     : Python module sys is not a pymathics module.
      = $Failed
     """
     name = "LoadModule"
@@ -1768,9 +1768,6 @@ def apply(self, module, evaluation):
         except ImportError as e:
             evaluation.message(self.get_name(), 'notfound', module)
             return SymbolFailed
-        except PyMathicsLoadException as e:
-            evaluation.message(self.get_name(), 'notmathicslib', module)
-            return SymbolFailed
         else:
         # Add Pymathics` to $ContextPath so that when user don't
         # have to qualify Pymathics variables and functions,

mathics/core/definitions.py

@@ -115,7 +115,7 @@ def load_pymathics_module(self, module, remove_on_quit=True):
         from an external Python module in the pymathics module namespace.
         """
         import importlib
-        from mathics.builtin import is_builtin, builtins, builtins_by_module, Builtin
+        from mathics.builtin import is_builtin, builtins_by_module, Builtin
         # Ensures that the pymathics module be reloaded
         import sys
         if module in sys.modules: