CF Checker crash in chkAttribute

[ros]

------------------
Checking variable: longitude
------------------
Traceback (most recent call last):
  File "/home/ros/bin/cfchecks_2-0-0.py", line 2194, in 
    inst.checker(file)
  File "/home/ros/bin/cfchecks_2-0-0.py", line 349, in checker
    if not self.chkAttribute(attribute,var,allCoordVars): rc=0
  File "/home/ros/bin/cfchecks_2-0-0.py", line 1019, in chkAttribute
    if var.dtype.char != var.attributes[attribute].dtype.char:
AttributeError: 'function' object has no attribute 'char'

[ros]

Example files in:

~ros/netcdf_files/nc4/AndrewClegg_Trac54.nc
~ros/netcdf_files/nc4/NanGalbraith_Trac54.nc

[ros]

With the transition to cdms2 determining variable types changed from arr.typecode() to arr.dtype.char.

However, this only works for FileVariables? and attributes and not for FileAxis? variables.

>>> f.variables.keys()
['l2_flags', 'nLw_413', 'nLw_490', 'nLw_560', 'total_susp', 'mercator',   'nLw_510', 'algal_2', 'algal_1', 'toa_veg', 'nLw_619', 'nLw_443', 'yellow_subs', 'boa_veg']
>>>> 
>>>> f.axes.keys()
['latitude', 'longitude', 'time']
>>>> 
>>>> f['total_susp'].dtype.char
'f'
>>>> 
>>>> f['time'].dtype.char
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
 AttributeError: 'function' object has no attribute 'char'
>>>> 
>>>> f['time'].typecode()
'd'

Emailed cdat-discussion mailing list. The cdat guys hadn't noticed this and will hopefully make it more uniform in due course.

For now I need to determine if the variable is a FileVariable? or FileAxis? and act accordingly.

[ros]

Fix committed at r123

[ros]

Whilst fixing this problem I noticed that Andrew Clegg's test file, listed above, was generating ut_are_convertible(): NULL unit argument warnings. This is caused by continuing to run further units checks on an invalid unit.

Solution: Return from chkUnits function if a unit is determined invalid.

r124