Ensure sanitizeHTML gets a string (#2351)
Ensure sanitizeHTML gets a string (#2351)

Regression triggered by https://github.com/FreshRSS/FreshRSS/pull/2228
FreshRSS/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,romibi/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,marienfressinaud/FreshRSS,FreshRSS/FreshRSS,marienfressinaud/FreshRSS,romibi/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,romibi/FreshRSS,FreshRSS/FreshRSS,marienfressinaud/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS