Crash when vertices overlay

[StealthyKamereon]

Let's say I have a first shape with points [(0, 0), (1, 0), (1, 1)] and a second shape with points [(0, 0), (1, 0), (1, -1)]
This crashes the program with error :

File "pyvisgraph/vis_graph.py", line 82, in build
    for edge in _vis_graph(self.graph, batch):
  File "pyvisgraph/vis_graph.py", line 156, in _vis_graph
    for p2 in visible_vertices(p1, graph, scan='half'):
  File "pyvisgraph/visible_vertices.py", line 110, in visible_vertices
    insort(open_edges, k)
  File "pyvisgraph/visible_vertices.py", line 346, in insort
    if x < a[mid]: hi = mid
  File "pyvisgraph/visible_vertices.py", line 388, in __lt__
    aslf = angle2(self.p1, self.p2, self.edge.get_adjacent(same_point))
UnboundLocalError: local variable 'same_point' referenced before assignment

[SteynJanus]

I have this problem aswel. Did you already happen to find a solution? Thanks in advance :)

[SteynJanus]

I have this problem aswel. Did you already happen to find a solution? Thanks in advance :)

#26