Handle of non-standard label

[aTrotier]

What happened?

When a non-standard label is used in the .seq format, we get an error in get_label function :

.seq : 139 1 IMA

ERROR: type AdcLabels has no field IMA
Stacktrace:
 [1] setproperty!(x::AdcLabels, f::Symbol, v::Int64)
   @ Base ./Base.jl:51
 [2] get_label(seq::Sequence, nBlocks::Int64)

This function should bypass the non-existing label (maybe just print a warning)

Environment

OS arm64-apple-darwin24.0.0
Julia 1.11.5
KomaMRIPlots 0.9.5
KomaMRIFiles 0.9.4
KomaMRI 0.9.2
KomaMRICore 0.9.5
KomaMRIBase 0.9.4