Indexer fails to record multiple call edges for a single call site

[mlangkabel]

Consider the following code snippet:

def foo(bar):
    bar.bar()

class A:
    def bar(self):
        print("A")

class B:
    def bar(self):
        print("B")

foo(A())
foo(B())

When indexing this snippet the SourcetrailPythonIndexer only records the call from foo to A.bar but misses the call to B.bar.

[mlangkabel]

Fixed by commit 6fd53ae2.