Fixed problem with exception handling

apdUnitCreator.cpp

@@ -54,7 +54,7 @@ int main(int argc, char* argv[]) {
             std::string capsuleSerial = newUnit->blueSerial + "/" + newUnit->redSerial;
             proddb->createApdUnit(capsuleSerial, newUnit->crystalSerial, newUnit->barCode);
         }
-        catch (std::exception e) {
+        catch (std::exception &e) {
             nFailed++;
             std::cerr << "An error occurred on APD paid with red APD " << newUnit->redSerial << " and blue APD " << newUnit->blueSerial << "!" << std::endl;
             std::cerr << e.what() << std::endl << std::endl;