[sysid] Fix crash when all data is filtered out during analysis (#7199)

Author: Gold856

sysid/src/main/native/cpp/analysis/FilteringUtils.cpp

@@ -326,9 +326,11 @@ static units::second_t GetMaxStepTime(
     auto& dataset = it.getValue();
 
     if (IsRaw(key) && wpi::contains(key, "dynamic")) {
-      auto duration = dataset.back().timestamp - dataset.front().timestamp;
-      if (duration > maxStepTime) {
-        maxStepTime = duration;
+      if (!dataset.empty()) {
+        auto duration = dataset.back().timestamp - dataset.front().timestamp;
+        if (duration > maxStepTime) {
+          maxStepTime = duration;
+        }
       }
     }
   }