[data] Improve CachedDataSink error messages
If the opening of the cache file fails, print an error message to know where to look at.
| Status | Name | Job ID | Coverage | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Build | |||||||||
| passed | build_linux_36 |
#185869
docker
|
00:02:50
|
73.0% |
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| passed | build_linux_37 |
#185870
docker
|
00:02:48
|
73.0% |
|
||||
| passed | build_macosx_36 |
#185867
macosx
|
00:02:44
|
73.0% |
|
||||
| passed | build_macosx_37 |
#185868
macosx
|
00:02:40
|
73.0% |
|
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