Use typed placeholders for blank transport fallback errors

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

hyperbrowser/transport/error_utils.py

@@ -47,9 +47,12 @@
 
 def _safe_to_string(value: Any) -> str:
     try:
-        return str(value)
+        normalized_value = str(value)
     except Exception:
         return f"<unstringifiable {type(value).__name__}>"
+    if normalized_value.strip():
+        return normalized_value
+    return f"<{type(value).__name__}>"
 
 
 def _normalize_request_method(method: Any) -> str:

tests/test_transport_error_utils.py

@@ -153,6 +153,11 @@ def __str__(self) -> str:
         raise RuntimeError("cannot stringify fallback error")
 
 
+class _BlankFallbackError(Exception):
+    def __str__(self) -> str:
+        return "   "
+
+
 class _BrokenFallbackResponse:
     @property
     def text(self) -> str:
@@ -693,6 +698,12 @@ def test_extract_error_message_handles_broken_fallback_response_text():
     assert message == "<unstringifiable _UnstringifiableFallbackError>"
 
 
+def test_extract_error_message_uses_placeholder_for_blank_fallback_error_text():
+    message = extract_error_message(_DummyResponse("   ", text="   "), _BlankFallbackError())
+
+    assert message == "<_BlankFallbackError>"
+
+
 def test_extract_error_message_extracts_errors_list_messages():
     message = extract_error_message(
         _DummyResponse({"errors": [{"msg": "first issue"}, {"msg": "second issue"}]}),