Fix KeyError for bitell types.

compiler/modules/module_type.py

@@ -67,4 +67,8 @@ class ModuleType():
         self.names[b] = c
 
     def __getitem__(self, b):
+        if b not in self.names.keys():
+            raise KeyError
+        
         return self.names[b]
+        

compiler/sram_factory.py

@@ -36,6 +36,8 @@ class sram_factory:
         A generic function to create a module with a given module_type.
         The args are passed directly to the module constructor.
         """
+        real_module_type = module_type
+        
         try:
             from tech import tech_modules
             real_module_type = tech_modules[module_type]
@@ -43,6 +45,9 @@ class sram_factory:
             # If they didn't define these, then don't use the option types.
             # Primarily for backward compatibility and simplicity of tech files.
             pass
+        except KeyError:
+            # If it wasn't a tech  module type, we can ignore that too.
+            pass
         
         if hasattr(OPTS, module_type):
             # Retrieve the name from OPTS if it exists,