Fix issue where gdb.execute during object loading causes an exception.

[SamiKalliomaki]

Please note I have roughly no idea what I am doing and all of this code may be stupid. However, it solves the issue for me.

#1754

[gsingh93]

Thanks for the contribution! Would you be able to add a test case for this issue first so we can better understand the problem and your solution, and make sure this doesn't regress in the future? See https://github.com/pwndbg/pwndbg/blob/dev/DEVELOPING.md#testing

[SamiKalliomaki]

Considering this makes a lot tests fail - I suspect this will not be able to merged in the current iteration. I think the issue is that I don't really understand the issue myself that well either.

What I have found is that running gdb.execute from this event handler seems to crash. I would guess this is because there is probably another command already in progress. But this might be a GDB bug as well (assuming the issue is not reproducible for everyone).

So right now I'd be looking for feedback on the approach and then we could see if there is a reproducible test that can be implemented.

[codecov-commenter]

Codecov Report

Merging #1755 (2182b71) into dev (1d635f0) will decrease coverage by 56.47%.
The diff coverage is 40.00%.

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@@            Coverage Diff             @@
##              dev   #1755       +/-   ##
==========================================
- Coverage   60.63%   4.17%   -56.47%     
==========================================
  Files         175     175               
  Lines       21300   21308        +8     
  Branches     1909    1909               
==========================================
- Hits        12915     889    -12026     
- Misses       7745   20298    +12553     
+ Partials      640     121      -519     

Impacted Files	Coverage Δ
pwndbg/gdblib/arch.py	30.00% <0.00%> (-43.34%)	⬇️
pwndbg/gdblib/events.py	12.58% <42.85%> (-67.84%)	⬇️

... and 162 files with indirect coverage changes