Fix stuck merge process by correcting input stream validation Issue #2953

[phanlezz]

Fix for importers who were stuck on merge process

This fixes a typo that caused the parsing to fail on nearly every OS, on different terminals, depending on, if they send an EOF token or not.
The typo was introduced during the compatibility conversion to java8: #2930
This available check is required, because of a workaround described here #2854

Root of the problem is that we always wait for stdin: #2858

Issue: #2953

[ce-bo]

This Bug should have broken out Pipeline. Would you please Check golden_test.sh and extend the script to have a regression test? Thank you!

[sonarcloud]

[CodeCharta Analysis] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[sonarcloud]

[CodeCharta Visualization] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[phanlezz]

This Bug should have broken out Pipeline. Would you please Check golden_test.sh and extend the script to have a regression test? Thank you!

I think we should merge this for now as-is. It is difficult to build tests that simulate an open input stream on a command line.
We need to fix our behavior for input files. An issue is already open for this.

[BridgeAR]

I think we should merge this for now as-is. It is difficult to build tests that simulate an open input stream on a command line.
We need to fix our behavior for input files. An issue is already open for this.

Merging this as is means the test is going to be deprioritized and that seems quite urgent.
We can execute the command and check that it's successful and the output file is generated. That would be a sufficient test. The file would have to be created in a temp file with a random name and should be deleted after the test.