Fix device created empty string

[frenck]

Proposed Changes

Fixing device created being an empty string.

Debugged here: home-assistant/core#61599 (comment)

[codecov-commenter]

Codecov Report

Merging #29 (1c2e14a) into main (6bc8c3a) will decrease coverage by 2.49%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   94.00%   91.50%   -2.50%     
==========================================
  Files           4        4              
  Lines         100      106       +6     
  Branches       14       15       +1     
==========================================
+ Hits           94       97       +3     
- Misses          5        8       +3     
  Partials        1        1              

Impacted Files	Coverage Δ
src/tailscale/models.py	92.00% <50.00%> (-5.73%)	⬇️

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