always return falsey when slo has no data

Signed-off-by: Sylvain Hellegouarch <sh@defuze.org>

Author: Lawouach

CHANGELOG.md

@@ -4,6 +4,11 @@
 
 [Unreleased]: https://github.com/chaostoolkit-incubator/chaostoolkit-google-cloud-platform/compare/0.32.1...HEAD
 
+### Changed
+
+* Always return falsey from `chaosgcp.monitoring.proves.valid_slo_ratio_during_window`
+  when no data was found for the SLO
+
 ## [0.32.1][] - 2024-05-31
 
 [0.32.1]: https://github.com/chaostoolkit-incubator/chaostoolkit-google-cloud-platform/compare/0.32.0...0.32.1

chaosgcp/monitoring/probes.py

@@ -326,6 +326,10 @@ def valid_slo_ratio_during_window(
 
     logger.debug(f"Return SLO health: {response}")
 
+    if not response:
+        logger.debug("SLO has no data for that period of time")
+        return False
+
     points = response[0]["points"]
 
     good = 0