Minor exporters adjustment

[RubenImhoff]

For a deterministic run (n_ens_mem = 1), the shape of var_f is [n_timesteps, y, x]. The exporter assumed a shape of [n_ens_members, n_timesteps, y, x], which is no longer the case (changed a few releases ago). Hence, the indexation was incorrect (returning the shape of y instead of n_timesteps).

[codecov[bot]]

Codecov Report

Merging #272 (6218ddc) into master (2dbd3de) will increase coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #272      +/-   ##
==========================================
+ Coverage   82.23%   82.33%   +0.10%     
==========================================
  Files         158      158              
  Lines       12117    12130      +13     
==========================================
+ Hits         9964     9987      +23     
+ Misses       2153     2143      -10     

Flag	Coverage Δ
unit_tests	82.33% <100.00%> (+0.10%)	:arrow_up:

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Impacted Files	Coverage Δ
pysteps/io/exporters.py	55.12% <100.00%> (+2.77%)	:arrow_up:
pysteps/tests/test_exporters.py	100.00% <100.00%> (ø)

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[dnerini]

Hi @RubenImhoff, thanks for spotting the problem and suggesting the fix. Would it be possible to include a test that would have detected the issue in the first place?

[RubenImhoff]

I think so, I'll have a look at it!