Avoid invalid strategy when sampling from empty sequence

Author: cbourjau

array_api_tests/hypothesis_helpers.py

@@ -186,11 +186,11 @@ def oneway_broadcastable_shapes(draw) -> OnewayBroadcastableShapes:
 real_floating_dtypes = sampled_from(dh.real_float_dtypes)
 numeric_dtypes = sampled_from(dh.numeric_dtypes)
 # Note: this always returns complex dtypes, even if api_version < 2022.12
-complex_dtypes = sampled_from(dh.complex_dtypes)
+complex_dtypes: SearchStrategy[Any] | None = sampled_from(dh.complex_dtypes) if dh.complex_dtypes else None
 
 def all_floating_dtypes() -> SearchStrategy[DataType]:
     strat = floating_dtypes
-    if api_version >= "2022.12":
+    if api_version >= "2022.12" and complex_dtypes is not None:
         strat |= complex_dtypes
     return strat