Add default values to network data object

[alyezz]

Summary of Changes

• Add default initialization values to Network Data object to prevent null pointer exceptions
• Add toString conversion

[codecov[bot]]

Codecov Report

Merging #153 (e4dd6b8) into master (f9e030a) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #153   +/-   ##
=======================================
  Coverage   73.15%   73.15%           
=======================================
  Files          14       14           
  Lines         555      555           
=======================================
  Hits          406      406           
  Misses        149      149           

Impacted Files	Coverage Δ
lib/models/network_data.dart	0.00% <0.00%> (ø)

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[InstabugCI]

	1 Error
:no_entry_sign:	Please include a CHANGELOG entry. You can find it at CHANGELOG.md.

Generated by :no_entry_sign: Danger

[TheBuggedYRN]

Closing this because it's now outdated (a lot have changed in the past 2 years). We now have a constructor for NetworkData, that handles this case.