[cmd] Do not change directory for parse command

[csordasmarton]

Closes #1224

[gyorb]

Here is an overview of what got changed by this pull request:

Complexity decreasing per file
==============================
+ analyzer/codechecker_analyzer/cmd/parse.py  -2
         

See the complete overview on Codacy

[bruntib]

The command CodeChecker parse fails with the following scenario:

1. Create a source file in a project directory: hello/main.cpp.
2. Analyze the project to a report directory.
3. Rename the report directory to hello2.
4. Use CodeChecker parse command on the report directory.

The crash happens when the command tries to check whether the source file has been modified since the last analysis. Until this patch we got a log message which says "Can not parse reports safely." This means that now the report directory is not portable as @gyorb remarked in #1224.

[gyorb]

renaming the report directory worked for me with this change, the reports still can be parsed but if the original project was renamed I get this error because of the missing files.

    if file_mtime > plist_mtime:
TypeError: '>' not supported between instances of 'NoneType' and 'float

The original source file is not there anymore, but maybe we should allow the parsing in this case with the limitation that the source files can not be read and the content can not be shown only the data which is available in the plist report will be printed.
I that case at least the printing of the report data will be successful.

For the store command we should still check the source file availability because without that the reports can not be stored.
What do you think @csordasmarton @bruntib ?

[csordasmarton]

Closing this pull request as there have been no activity on it in a long time.