STYLE: make null constructed lists constexpr, noexcept

src/OpenFOAM/containers/Lists/DynamicList/DynamicList.H

src/OpenFOAM/containers/Lists/DynamicList/DynamicListI.H

src/OpenFOAM/containers/Lists/FixedList/FixedList.C

src/OpenFOAM/containers/Lists/FixedList/FixedList.H

src/OpenFOAM/containers/Lists/FixedList/FixedListI.H

src/OpenFOAM/containers/Lists/FixedList/FixedListIO.C

src/OpenFOAM/containers/Lists/PtrList/PtrList.C

src/OpenFOAM/containers/Lists/PtrList/PtrList.H

src/OpenFOAM/containers/Lists/PtrList/PtrListI.H

src/OpenFOAM/containers/Lists/SortableList/SortableList.C

src/OpenFOAM/containers/Lists/SortableList/SortableList.H

src/OpenFOAM/containers/Lists/UIndirectList/UIndirectList.H

src/OpenFOAM/containers/Lists/UIndirectList/UIndirectListI.H

...OpenFOAM/containers/Lists/UIndirectList/UIndirectListIO.C

src/OpenFOAM/containers/Lists/UList/UList.H

src/OpenFOAM/containers/Lists/UList/UListI.H

src/OpenFOAM/containers/Lists/UList/UListIO.C

src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H

src/OpenFOAM/containers/Lists/UPtrList/UPtrListI.H

src/OpenFOAM/fields/FieldFields/FieldField/FieldField.C