Merge pull request #30618 from Natelytle/ltca-broke-pp

Fix NaN PP counter values while SR is 0

osu.Game/Rulesets/Difficulty/Skills/StrainSkill.cs

@@ -74,6 +74,10 @@ public virtual double CountTopWeightedStrains()
                 return 0.0;
 
             double consistentTopStrain = DifficultyValue() / 10; // What would the top strain be if all strain values were identical
+
+            if (consistentTopStrain == 0)
+                return ObjectStrains.Count;
+
             // Use a weighted sum of all strains. Constants are arbitrary and give nice values
             return ObjectStrains.Sum(s => 1.1 / (1 + Math.Exp(-10 * (s / consistentTopStrain - 0.88))));
         }