Update dateLocaleProvider.js
Update dateLocaleProvider.js

formatDate returns now a string if invalid

Closes #7784

ilovett/material,david-gang/material,david-gang/material,ErinCoughlan/material,SamDLT/material,oostmeijer/material,gkalpak/material,welkinhealth/material,hayloft/material,HarrisCorp/material,profoundry-us/material,programmist/material,colinskow/material,angular/material,SamDLT/material,j3ski/material,hodeyp/material,bluebirdtech/material,imjoeco/material,colinskow/material,clshortfuse/material,welkinhealth/material,imjoeco/material,vertazzar/material,HarrisCorp/material,hayloft/material,acoreyj/material,Splaktar/material,daniel-nagy/material,ServiceManagementGroup/material,hayloft/material,crisbeto/material,angular/material,acoreyj/material,epelc/material,graingert/material,bluebirdtech/material,programmist/material,Splaktar/material,angular/material,oostmeijer/material,daniel-nagy/material,profoundry-us/material,graingert/material,HipsterZipster/material,clshortfuse/material,miguelcobain/material,ErinCoughlan/material,ServiceManagementGroup/material,marekmicek/material,DevVersion/material,j3ski/material,oostmeijer/material,david-gang/material,miguelcobain/material,gkalpak/material,ilovett/material,SamDLT/material,epelc/material,j3ski/material,epelc/material,Frank3K/material,gkalpak/material,Splaktar/material,hodeyp/material,pwistbac/material,Frank3K/material,crisbeto/material,acoreyj/material,Frank3K/material,HarrisCorp/material,ilovett/material,daniel-nagy/material,programmist/material,programmist/material,DevVersion/material,dmitriz/material,ServiceManagementGroup/material,acoreyj/material,marekmicek/material,gkalpak/material,HipsterZipster/material,clshortfuse/material,SamDLT/material,crisbeto/material,hodeyp/material,bluebirdtech/material,daniel-nagy/material,colinskow/material,welkinhealth/material,vertazzar/material,pwistbac/material,hodeyp/material,miguelcobain/material,imjoeco/material,ErinCoughlan/material,ilovett/material,angular/material,pwistbac/material,welkinhealth/material,vertazzar/material,HipsterZipster/material,hayloft/material,marekmicek/material,profoundry-us/material,marekmicek/material,bluebirdtech/material,profoundry-us/material,oostmeijer/material,dmitriz/material,crisbeto/material,Frank3K/material,ErinCoughlan/material,dmitriz/material,graingert/material,colinskow/material,dmitriz/material,DevVersion/material,pwistbac/material,HarrisCorp/material,epelc/material,miguelcobain/material,j3ski/material,imjoeco/material,vertazzar/material,HipsterZipster/material,david-gang/material,graingert/material,DevVersion/material,ServiceManagementGroup/material,clshortfuse/material,Splaktar/material