`cell method` Issue

[rhaegar325]

hur	Amon	Expected 'area: time: mean where air' from registry key 'cell_methods', got 'time: mean'.
ta	Amon	Expected 'area: time: mean where air' from registry key 'cell_methods', got 'time: mean'.
ua	Amon	Expected 'area: time: mean where air' from registry key 'cell_methods', got 'time: mean'.
va	Amon	Expected 'area: time: mean where air' from registry key 'cell_methods', got 'time: mean'.
wap	Amon	Expected 'area: time: mean where air' from registry key 'cell_methods', got 'time: mean'.
zg	Amon	Expected 'area: time: mean where air' from registry key 'cell_methods', got 'time: mean'.
rlus	Amon	Expected 'area: time: mean where sea_ice (mask=siconca)' from registry key 'cell_methods', got 'area: time: mean'.
rsus	Amon	Expected 'area: mean where land' from registry key 'cell_methods', got 'area: time: mean'.
rootd	fx	Expected 'area: mean where land' from registry key 'cell_methods', got 'area: mean'.
snc	LImon	Expected 'area: mean where land time: mean' from registry key 'cell_methods', got 'area: mean: time: mean'.*

where air — atmospheric 3D/column vars (hur, ta, ua, va, wap, zg)
where land — land surface vars (rsus, rootd, snc)
where sea_ice (mask=siconca) — rlus