Updates for lardataobj PR #54

[PetrilloAtWork]

See LArSoft/lardataobj#54.

Also includes a fix to a deficiency not directly related to that PR but exposed by it.

[FNALbuild]

The tests are being triggered in jenkins.
Tested with other pull request(s) LArSoft/lardataobj#54,LArSoft/lardataalg#53,LArSoft/larreco#88,DUNE/duneprototypes#97,DUNE/dunesim#101,DUNE/protoduneana#66,uboone/ubana#74,uboone/ublite#3,uboone/ubreco#34,uboone/ubevt#4,uboone/ubcore#4,SBNSoftware/sbndcode#880

[FNALbuild]

+LArSoft tests OK on slf7 for c14:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:LArSoft/view_builds/index?offset=0&builds=lar_ci/28606&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=&builds=

[FNALbuild]

The tests are being triggered in jenkins.
Tested with other pull request(s) LArSoft/lardataobj#54,LArSoft/lardataalg#53,LArSoft/larreco#88,DUNE/duneprototypes#97,DUNE/dunesim#101,DUNE/protoduneana#66,uboone/ubana#74,uboone/ublite#3,uboone/ubreco#34,uboone/ubevt#4,uboone/ubcore#4,SBNSoftware/sbndcode#880

[FNALbuild]

+LArSoft tests OK on slf7 for c14:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:LArSoft/view_builds/index?offset=0&builds=lar_ci/28608&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=&builds=

[FNALbuild]

+LArSoft tests OK on slf7 for e26:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:LArSoft/view_builds/index?offset=0&builds=lar_ci/28607&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=&builds=

[FNALbuild]

-uBooNE tests failed on slf7 for e26:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:uBooNE/view_builds/index?offset=0&builds=uboone_ci/13086&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/28607&builds=

[FNALbuild]

-SBND tests warning, with build warning,, with ignored warning for build, on slf7 for e26:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:SBND/view_builds/index?offset=0&builds=sbnd_ci/19349&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/28607&builds=

[FNALbuild]

-ICARUS tests failed, with build warning,, with ignored warning for build, on slf7 for e26:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:ICARUS/view_builds/index?offset=0&builds=icarus_ci/13588&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/28607&builds=

[FNALbuild]

-DUNE tests failed on slf7 for e26:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:DUNE/view_builds/index?offset=0&builds=dune_ci/20412&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/28607&builds=