fixed some funtion return bugs left over from A3. Passing 58/61 locally

MemberNodes.py

@@ -69,6 +69,7 @@ class MethodNode(ASTNode):
         self.children = []
         self.typeName = typeName
         self.order = order
+        self.myType = None
 
         # get method name
         nameNodes = getParseTreeNodes(['ID'], parseTree, ['params', 'type', 'methodBody'])
@@ -160,12 +161,12 @@ class MethodNode(ASTNode):
         for n in returnNodes:
             # Checking for functions of type void
             # Only valid if either the function doesn't have a return statement(checked above), or the return statement is a semicolon (return;)
-            if self.myType.name == "void":
+            if self.myType and self.myType.name == "void":
                 if n.myType:
                     raise Exception("ERROR: return type of function {} doesn't match with return statement.".format(self.name))
                 return
             # Checking for non void cases
-            if not self.myType.assignable(n.myType):
+            if self.myType and not self.myType.assignable(n.myType):
                 raise Exception("ERROR: return type of function {} doesn't match with return statement.".format(self.name))
         return