No grouping side effect

[set-soft]

I'm not sure about the following behavior:

KiBoM/kibom/component.py

Lines 120 to 121 in 06a1486

	if len(self.prefs.groups) == 0:
	return False

This disables the grouping mechanism, this is OK. But the side effect is that multi-part components will be repeated (as many times as sub-parts). I this the code should be:

if len(self.prefs.groups) == 0: 
    return self.getRef() == other.getRef()

So we don't get the same ref multiple times.