Loading a non-existant file does not raise Exception

[atw1020]

When attempting to load a non-existent file using MCSchematic, as shown below, MCSchematic does not raise an exception, or warn the user in any other way that they are doing somthing wrong.

schem = mcschematic.MCScematic("/non/existing/file.schem")

Looking into the source, it seems this is an intended feature, as there are if statements checking for file existence.

mcschematic.py:2371

        if type(schematicToLoadPath_or_mcStructure) == str:
            schematicToLoadPath = schematicToLoadPath_or_mcStructure

            if not os.path.isfile(schematicToLoadPath):
                self._defaultInit(); return

            if not schematicToLoadPath.endswith(".schem"):
                self._defaultInit(); return

            self._initFromFile(schematicToLoadPath)

This is extremly user-unfriendly because if you mess up the filepath you're loading, the user isn't informed that they've messed something up. I had a situation where I wanted to load a schematic, modify it, and write it back, and I wasted a ton of time looking for the blocks of the existing schematic and seeing nothing but air.