Fix to #616 A failed workflow causes a failed pixel values extraction

[hans-permana]

No description provided.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@cff3b50). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #617   +/-   ##
=========================================
  Coverage          ?   76.47%           
=========================================
  Files             ?       81           
  Lines             ?    11416           
  Branches          ?        0           
=========================================
  Hits              ?     8730           
  Misses            ?     2686           
  Partials          ?        0

Impacted Files	Coverage Δ
cate/conf/template.py	0% <ø> (ø)
cate/core/plugin.py	70.37% <ø> (ø)
cate/util/web/jsonrpchandler.py	74.03% <ø> (ø)
cate/webapi/service.py	100% <ø> (ø)
cate/util/im/cmaps.py	93.15% <ø> (ø)
cate/cli/main.py	64.59% <ø> (ø)
cate/webapi/websocket.py	46.62% <100%> (ø)
cate/ops/subset.py	94.28% <100%> (ø)

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[forman]

Good!