Fix div by zero with no tests

commander/gui/selectors.py

@@ -146,8 +146,10 @@ class OutcomeSummary(QLabel):
             color = utils.OUTCOME_COLORS[outcome]
             parts.append(f"<font color='{color.name()}'>{count} {outcome}</font>")
 
-        grade = 5 * summary['passed'] / sum(summary.values()) + 1
-        parts.append(f'≈ {round(grade, 2)}')
+        total = sum(summary.values())
+        if total:
+            grade = 5 * summary['passed'] / total + 1
+            parts.append(f'≈ {round(grade, 2)}')
 
         self.setText('<br>'.join(parts))