Update check_bipatrite.py

Author: MaximSmolskiy

graphs/check_bipatrite.py

@@ -31,9 +31,7 @@ def is_bipartite_dfs(graph: defaultdict[int, list[int]]) -> bool:
     >>> is_bipartite_dfs({0: [1, 3], 1: [0, 2], 2: [1, 3], 3: [0, 2], 4: [0]})
     False
     >>> is_bipartite_dfs({7: [1, 3], 1: [0, 2], 2: [1, 3], 3: [0, 2], 4: [0]})
-    Traceback (most recent call last):
-        ...
-    KeyError: 0
+    False
 
     >>> # FIXME: This test should fails with KeyError: 4.
     >>> is_bipartite_dfs({0: [1, 3], 1: [0, 2], 2: [1, 3], 3: [0, 2], 9: [0]})
@@ -121,9 +119,7 @@ def is_bipartite_bfs(graph: defaultdict[int, list[int]]) -> bool:
     >>> is_bipartite_bfs({0: [1, 3], 1: [0, 2], 2: [1, 3], 3: [0, 2], 4: [0]})
     False
     >>> is_bipartite_bfs({7: [1, 3], 1: [0, 2], 2: [1, 3], 3: [0, 2], 4: [0]})
-    Traceback (most recent call last):
-        ...
-    KeyError: 0
+    False
 
     >>> # FIXME: This test should fails with KeyError: 4.
     >>> is_bipartite_bfs({0: [1, 3], 1: [0, 2], 2: [1, 3], 3: [0, 2], 9: [0]})