Creator tools fails to load on Python 3+

[BigRoy]

Issue

What happened?

When trying to load the creator tool it fails to run because of the following error:

TypeError: setPropertyName(self, Union[QByteArray, bytes, bytearray]): argument 1 has unexpected type 'str'

However, when fixing that code by turning it into setPropertyName(b"value") with the b prefix then it resulted in a crash because of an additonal bug.

TypeError: unable to convert a Python 'NoneType' object to a C++ 'QColor' instance

It fails because of this line introduced with #448. It's easily resolved by initializing the value with a valid QColor as proposed on Gitter

To Reproduce

• Run Python 3+ with PyQt5
• Run code:

  from avalon.tools import creator
  creator.show()

Additional context

• First brought up by @jasperges on Avalon gitter here and here
• Confirmed by me on Avalon gitter with a fix here