fix double adding segments for camel case conversion, and make decorator not convert strings if they are the direct return from a method

Author: Tom-Kingstone

Python_Engine/Python/src/python_toolkit/bhom/bhom_object.py

@@ -37,6 +37,7 @@ def convert_camel_to_pascal(s: str):
             continue
         elif sec.startswith("_"):
             parts.append(sec)
+            continue
 
         parts.append(sec.capitalize())
 

Python_Engine/Python/src/python_toolkit/bhom/decorators/_bhom_callable_decorator.py

@@ -61,6 +61,10 @@ def wrapper(*args, **kwargs) -> Union[str, Any]:
                 rtn = function(*args, **kwargs)
 
                 if do_wrap:
+                    #don't bother serialising if the method already returns a string.
+                    if isinstance(rtn, str):
+                        return rtn
+
                     json_rtn = json.dumps(rtn, cls=encoder_cls)
 
                     return json_rtn