Fix movePortfolioFunds integration test

[HenriqueNogara]

changelog

modified API

• Portfolio.move_portfolio_funds returns error EmptyTransfer if no assets are moved (zero amount or zero NFT ids).

[codecov[bot]]

Codecov Report

Merging #1477 (ecee7ac) into develop (5fbfdf0) will decrease coverage by 0.02%. The diff coverage is 40.00%.

:exclamation: Current head ecee7ac differs from pull request most recent head 322d102. Consider uploading reports for the commit 322d102 to get more accurate results

@@             Coverage Diff             @@
##           develop    #1477      +/-   ##
===========================================
- Coverage    53.94%   53.93%   -0.02%     
===========================================
  Files          151      151              
  Lines        32890    32894       +4     
===========================================
- Hits         17743    17741       -2     
- Misses       15147    15153       +6     

Impacted Files	Coverage Δ
pallets/portfolio/src/lib.rs	80.43% <40.00%> (-0.19%)	:arrow_down:

... and 6 files with indirect coverage changes