Related to closed issue #1159

Combining UVData objects fails when parameter scan_number_array is supplied. I am trying to concatenate two time-adjacent UVData objects read from .ms files. Each have 62128 blts, so the combined object should have Nblts=124256. The concatenation fails with error ValueError: UVParameter _scan_number_array is not expected shape. Parameter shape is (62128,), expected shape is (124256,).. Setting uv.scan_number_array=None for each object before combining bypasses the error.