Resolve undefined behavior with VLAs length

RecoEcal/EgammaClusterAlgos/src/Multi5x5BremRecoveryClusterAlgo.cc:47:34:
runtime error: variable length array bound evaluates to non-positive
value 0
RecoEcal/EgammaClusterAlgos/src/Multi5x5BremRecoveryClusterAlgo.cc:50:30:
runtime error: variable length array bound evaluates to non-positive
value 0

Multi5x5BremRecoveryClusterAlgo::makeIslandSuperClusters(..) is called
with empty clusters_v. There is nothing to be done if clusters_v is
empty, thus bail out early.

This happens 36 times while running short matrix.

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Updating miniAOD to add CMS top tagger tag infos
Fixing screwup with rebase
Fixing comments
move all vector/matrix instantiation to constructor
Merged topythia8200pre1_73 from repository mkirsano
Merge pull request #5420 from cms-sw/CMSSW_7_2_X

Forward port CMSSW_7_2_X into CMSSW_7_3_X
save 64bits
Replaced any TMatrix and TVector by SMatrix and SVector in MET significance code
comments cleaning
Merge branch '72X_METMatrixChange' of github.com:mmarionncern/cmssw into 72X_METMatrixChange
fix getByLabel
making the dR comparision  dR2
remove couts, moved 0 pointers to nullptr pointers
Migrate from external data
remove last couts in RecoMET/METPUsubtraction classes
Merged CMSSW_7_3_X from repository cms-sw
Merged refs/pull/5413/head from repository cms-sw
Allow HLT_PFJet260 back in the GRun table, Migration of e+tau path to common electron WP, Fix wrong settings in hltEle27WP85GsfMissingHitsFilter
Allow HLT_PFJet260 back in the GRun table, Migration of e+tau path to common electron WP, Fix wrong settings in hltEle27WP85GsfMissingHitsFilter