T13947 model interface

[niden]

Hello!

• Type: bug fix
• Link to issue: Phalcon model interface doens't allow false return #13947

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I updated the CHANGELOG

Small description of change:

Thanks

[codecov]

Codecov Report

Merging #13948 into 4.0.x will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            4.0.x   #13948   +/-   ##
=======================================
  Coverage   67.64%   67.64%           
=======================================
  Files         469      469           
  Lines       94350    94350           
=======================================
  Hits        63821    63821           
  Misses      30529    30529

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