workaround for DiskSpaceReservationRequest negative content

common/dataStructures/DiskSpaceReservationRequest.cpp

@@ -31,10 +31,10 @@ void DiskSpaceReservationRequest::addRequest(const std::string& diskSystemName,
 void DiskSpaceReservationRequest::removeRequest(const std::string& diskSystemName, uint64_t size) {
   try {
     if (at(diskSystemName) < size) {
-      throw cta::exception::Exception("At DiskSpaceReservationRequest::removeRequest(): Removing request of " + std::to_string(size) +
-        " bytes from disk system" + diskSystemName + " which only has " + std::to_string(at(diskSystemName)) + " bytes");
+      at(diskSystemName) = 0;
+    } else {
+      at(diskSystemName) -= size;
     }
-    at(diskSystemName) -= size;
   } catch (std::out_of_range &) {
       throw cta::exception::Exception("At DiskSpaceReservationRequest::removeRequest(): Removing request of " + std::to_string(size) +
         " bytes from disk system" + diskSystemName + " which does not exist");