Fix IP.Summary() crash when dst is RandIP()

[KelvinOmar98]

Changes:

• Prevent IP.summary() from crashing on randomized destinations
• Add UTScapy regression test covering this case

Fix #4883

[guedou]

Good catch!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.79%. Comparing base (40fc5ec) to head (140ba64).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4896      +/-   ##
==========================================
- Coverage   80.85%   80.79%   -0.06%     
==========================================
  Files         369      351      -18     
  Lines       90961    90682     -279     
==========================================
- Hits        73542    73270     -272     
+ Misses      17419    17412       -7     

Files with missing lines	Coverage Δ
scapy/layers/inet.py	71.92% <100.00%> (+0.01%)	⬆️

... and 282 files with indirect coverage changes

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