[PATCH v2] dts: fix pass rate edge case in results json

[Dean Marx <dmarx@iol.unh.edu>]

Add condition to results.json pass rate generation
method which returns 0 as the pass rate when the suite
is skipped, rather than causing a divide by 0 error.

Fixes: 9f8a257235ac ("dts: improve test run result statistics")

Signed-off-by: Dean Marx <dmarx@iol.unh.edu>
---
 dts/framework/test_result.py | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/dts/framework/test_result.py b/dts/framework/test_result.py
index ba7c1c9804..45fc2e8241 100644
--- a/dts/framework/test_result.py
+++ b/dts/framework/test_result.py
@@ -324,13 +324,10 @@ def generate_pass_rate_dict(self, test_run_summary) -> dict[str, float]:
         Returns:
             A dictionary with the PASS/FAIL ratio of all test cases.
         """
-        return {
-            "PASS_RATE": (
-                float(test_run_summary[Result.PASS.name])
-                * 100
-                / sum(test_run_summary[result.name] for result in Result if result != Result.SKIP)
-            )
-        }
+        cases_not_skipped = sum(
+            test_run_summary[result.name] for result in Result if result != Result.SKIP
+        )
+        return {"PASS_RATE": test_run_summary[Result.PASS.name] * 100.0 / max(cases_not_skipped, 1)}
 
 
 class DTSResult(BaseResult):
-- 
2.44.0