Fix non named error

[jLopezbarb]

Signed-off-by: Javier López Barba javier@okteto.com

Fixes Fix a bug for non existing absolute paths results in named volume errors

Proposed changes

• Creates a new function to check if a named volume is not declared on the top level struct

[codecov]

Codecov Report

Merging #1536 (3bc32ef) into master (622e706) will increase coverage by 0.08%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master    #1536      +/-   ##
==========================================
+ Coverage   35.96%   36.05%   +0.08%     
==========================================
  Files          88       88              
  Lines        8405     8413       +8     
==========================================
+ Hits         3023     3033      +10     
+ Misses       5015     5013       -2     
  Partials      367      367              

Impacted Files	Coverage Δ
pkg/model/stack_serializer.go	54.73% <77.77%> (+1.08%)	⬆️

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