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Function check_metadat() in wdata.c handles error from wdata_parse_metadata_file().

For example, when datadim = 3 but user provides only two or less diemnsions (nx, ny) or (dx, dy) code should produce error. But for:

nx                       24   # lattice
#ny                       28   # lattice
#nz                       32   # lattice
dx                        1   # spacing
dy                        1   # spacing
dz                        1   # spacing
datadim                   3   # dimension of block size: 1=nx, 2=nx*ny, 3=nx*ny*nz

it does not produce any ierr and message, but rather can not read a variable.wdat