MAT.jl v0.11.1 cannot read a file it wrote, containing empty dictionary

[jaakkor2]

Write the file with MAT.jl v0.11.1. Reading the file works in v0.10.7, but not in v0.11.1. This is a regression.

julia> matwrite("foo.mat", Dict("foo" => Dict{String, Any}()))

julia> matread("foo.mat")
ERROR: ArgumentError: collection must be non-empty
Stacktrace:
 [1] first
   @ .\abstractarray.jl:473 [inlined]
 [2] convert_struct_array(d::Dict{String, Any}, class::String)
   @ MAT.MAT_types C:\Users\jaakkor2\.julia\packages\MAT\Y70j6\src\MAT_types.jl:316
 [3] m_read(g::HDF5.Group, subsys::MAT.MAT_subsys.Subsystem)
   @ MAT.MAT_HDF5 C:\Users\jaakkor2\.julia\packages\MAT\Y70j6\src\MAT_HDF5.jl:330
 [4] read(f::MAT.MAT_HDF5.MatlabHDF5File, name::String)
   @ MAT.MAT_HDF5 C:\Users\jaakkor2\.julia\packages\MAT\Y70j6\src\MAT_HDF5.jl:345
 [5] read(f::MAT.MAT_HDF5.MatlabHDF5File)
   @ HDF5 C:\Users\jaakkor2\.julia\packages\HDF5\Z859u\src\types.jl:24
 [6] matread(filename::String; table::Type)
   @ MAT C:\Users\jaakkor2\.julia\packages\MAT\Y70j6\src\MAT.jl:192
 [7] matread(filename::String)
   @ MAT C:\Users\jaakkor2\.julia\packages\MAT\Y70j6\src\MAT.jl:188
 [8] top-level scope
   @ REPL[7]:1

[foreverallama]

This should be fixed as a part of #208 .
Just to confirm, you are expecting the variable foo to contain an empty struct right?

[jaakkor2]

I just expect isempty to return true. MAT.jl v0.10.7 reads it as

julia> matread("foo.mat")
Dict{String, Any} with 1 entry:
  "foo" => Dict{String, Any}()

and Matlab

>> a=load("foo.mat")

a =

  struct with fields:

    foo: [1×1 struct]

>> a.foo

ans =

  struct with no fields.