Require cloud scripts to always have a name

[na--]

This fixes #923 and was originally part of #1869, but it makes more sense as a separate PR, so I split it apart.

[codecov-io]

Codecov Report

Merging #1870 (e77e159) into output-refactoring-2 (5e41f5e) will increase coverage by 0.07%.
The diff coverage is 80.00%.

@@                   Coverage Diff                    @@
##           output-refactoring-2    #1870      +/-   ##
========================================================
+ Coverage                 70.76%   70.83%   +0.07%     
========================================================
  Files                       181      182       +1     
  Lines                     14163    14167       +4     
========================================================
+ Hits                      10022    10035      +13     
+ Misses                     3518     3512       -6     
+ Partials                    623      620       -3     

Flag	Coverage Δ
ubuntu	70.79% <80.00%> (+0.03%)	⬆️
windows	70.43% <80.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
stats/cloud/collector.go	81.92% <80.00%> (+0.15%)	⬆️
cmd/ui_windows.go	0.00% <0.00%> (ø)
lib/executor/vu_handle.go	95.23% <0.00%> (+1.90%)	⬆️
js/initcontext.go	92.30% <0.00%> (+2.19%)	⬆️
lib/executors.go	93.10% <0.00%> (+2.29%)	⬆️
cloudapi/config.go	44.15% <0.00%> (+2.59%)	⬆️
js/common/initenv.go	100.00% <0.00%> (+13.33%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5e41f5e...e77e159. Read the comment docs.

[mstoykov]

LGTM. But I prefer we check the error for the more important part of the message ;)

The base branch was changed.