Fix: Panic when node account id is not in network list

[bamzedev]

Description:
When a transaction has Node Account Id with is not present in the current network the client panics. This PR fixes this. It should now fail gracefully.

Related issue(s):

Fixes #802

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02% 🎉

Comparison is base (a188610) 69.52% compared to head (046f586) 69.54%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #805      +/-   ##
===========================================
+ Coverage    69.52%   69.54%   +0.02%     
===========================================
  Files          164      164              
  Lines        33872    33875       +3     
===========================================
+ Hits         23548    23558      +10     
+ Misses        8956     8951       -5     
+ Partials      1368     1366       -2     

Files Changed	Coverage Δ
network.go	84.02% <100.00%> (+0.33%)	⬆️

... and 3 files with indirect coverage changes

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