small fix for zero energy (#117)

* fix random bug

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/TRestDetectorHitsReadoutAnalysisProcess.cxx

@@ -21,10 +21,12 @@ TRestEvent* TRestDetectorHitsReadoutAnalysisProcess::ProcessEvent(TRestEvent* in
         const auto time = fInputHitsEvent->GetTime(hitIndex);
         const auto type = fInputHitsEvent->GetType(hitIndex);
 
-        if (energy <= 0) {
+        if (energy == 0) {
+            continue;
+        } else if (energy < 0) {
             // this should never happen
             cerr << "TRestDetectorHitsReadoutAnalysisProcess::ProcessEvent() : "
-                 << "Negative or zero energy found in hit " << hitIndex << endl;
+                 << "Negative energy found in hit " << hitIndex << endl;
             exit(1);
         }