Python: Add test case for #6227

Author: tausbn

python/ql/test/query-tests/Exceptions/generators/UnguardedNextInGenerator.expected

@@ -1,2 +1,3 @@
 | test.py:5:15:5:22 | ControlFlowNode for next() | Call to next() in a generator |
 | test.py:10:20:10:27 | ControlFlowNode for next() | Call to next() in a generator |
+| test.py:62:19:62:28 | ControlFlowNode for next() | Call to next() in a generator |

python/ql/test/query-tests/Exceptions/generators/test.py

@@ -53,3 +53,12 @@ def ok5(seq):
 
 def ok6(seq):
     yield next(iter([]), default='foo')    
+
+# Handling for multiple exception types, one of which is `StopIteration`
+# Reported as a false positive in github/codeql#6227
+def ok7(seq, ctx):
+    try:
+        with ctx:
+            yield next(iter)
+    except (StopIteration, MemoryError):
+        return