importOSMeasure error when valid inputs are choices taken from os model

[Larry7707]

This is basically a followup for issue #724. When importing ReduceSpaceInfiltrationByPercentage, the first input _ApplytheMeasuretoaSpecificTypeortotheEntireModel is to choose a space type to apply the measure. When validating the inputs, the valid values taken from the xml file is a GUID in a curly bracket, which will lead a warning for invalid input and throw an error because of input being None. This is the reason for the breakdown in Elliot's follow-up post. Similar bugs will also occur in several other measures where the valid values for inputs are GUIDs. I feel like it is hard to fix this perfectly, so maybe it is possible to just detect when GUID is used and assign the value to the inputs anyway even if it is invalid to prevent such breakdown. I can help to fix it if you want. Let me know how it goes. Thanks!