Zero cluster_size

[ahussein1194]

• We have some clusters with (cluster_size = 0) and that's because some events don't have any of their digis pass one of the two tests that come before the first increasing of (cluster_size): these two tests are the test for the Barrel region and the test for bx. So when we push the value of (cluster_size) in the vector the second time, i.e., after the end of the chamber loop, it stores the default value of (cluster_size) which is zero and defined before the first chamber loop. So the entries for (cluster_size = 0) correspond to the number of ignored events.

• For the map of (clusterSize_bx), it already stores the same value for (cluster_size = 0) in the map but this time the corresponding bx value is -10000 which is the default value also and that's why we don't see it in the 2D histo. But if we make some zoom in we find the bx value of -10000 corresponding to (cluster_size = 0) shown here
  https://github.com/ahussein1194/summerStudentProject_Ahmed/blob/main/RPC2TMAna/results/zeroSize_clusters.png