fixed the script under certain cases

[chameleon10712]

Fixed the following cases.
Case 1: When the path contains several underscore, ex. my_test/Carpetfuzz/output/relation/relation_tiffcp.json, the script cannot function normally.
Case 2: When the NLP model generate partial invalid relationship / arguments, the subprocess of executeCommand() may return the result to stderr instead of stdout. This leads rank_combination.py fail to generate the corresponding file.

[waugustus]

Hi, thank you for the fix. As for the second case, I don't quite understand why the subprocess of executeCommand() may return the result to stderr. Could you please provide a specific example?

[chameleon10712]

Case like jpegtran from the latest libjpeg-turbo.
Without adding the stderr information, the rank_combination.py script will show [Error] Failed to get bitmap through cmd line

[waugustus]

Hello, thank you for your fix. Regarding the second issue, I tried running rank_combination.py on the latest version of libjpeg-turbo and didn't encounter this error. My version is commit 9b704f. Could you provide me with the version information you tested with? I believe your fix is sound; I'm just amazed at the existence of this issue.

root@f2c682b9b29f:~/programs/libjpeg-turbo# python3 ${CarpetFuzz}/scripts/rank_combination.py --combination ${CarpetFuzz}/output/combination/combination_jpegtran.txt --dict ${CarpetFuzz}/tests/dict/dict.json --bindir $PWD/build_carpetfuzz/bin --seeddir input
[OK] Successfully generate the ranked stub file - /root/CarpetFuzz/output/stubs/ranked_stubs_jpegtran.txt
root@f2c682b9b29f:~/programs/libjpeg-turbo# git log
commit 9b704f96b2dccc54363ad7a2fe8e378fc1a2893b (HEAD -> main, origin/main, origin/HEAD)
Author: DRC <information@libjpeg-turbo.org>
Date:   Tue Aug 15 11:03:57 2023 -0400
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