rkt: fallback to local store fetch if discovery fails.
rkt: fallback to local store fetch if discovery fails.

If discovery fails for any reason (no domain, not meta tags but also
network errors) fallback to local store app fetch.

The fallback isn't done if discovery returns valid endpoints but the
the image fetching from the returned endpoints fails for any reason
(network errors, wrong signature, etc...).

iankronquist/rkt,kbrwn/rkt,michelangelo13/rkt,jonboulle/rkt,liubq919/rkt,s-urbaniak/rkt,chrisseto/rkt,liugenping/rkt,tmrts/rkt,yifan-gu/rkt,liugenping/rkt,sstabellini/rkt,iankronquist/rkt,cab105/rkt,sgotti/rkt,tixxdz/rkt,nhlfr/rkt,sstabellini/rkt,cab105/rkt,monstermunchkin/rkt,akshaykarle/rkt,yifan-gu/rocket,yifan-gu/rkt,monstermunchkin/rkt,shobhit85/rkt,yifan-gu/rocket,sinfomicien/rkt,alban/rkt,crawford/rkt,MattDees/rkt,joshix/rkt,intelsdi-x/rkt,fdserr/rkt,lucasallan/rkt,rkt/rkt,rhvgoyal/rkt,rot26/rkt,dgonyeo/rkt,Yhgenomics/rkt,endocode/rkt,alexhersh/rkt,mike1729/rkt,lucasallan/rkt,chrisseto/rkt,linki/rkt,bsmr-go/rkt,tmrts/rkt,Wilybald/rkt,shtouff/rkt,sgotti/rkt,joshix/rkt,iaguis/rkt,alexhersh/rkt,chrisseto/rkt,kbrwn/rkt,ChengTiesheng/rkt,akshaykarle/rkt,yifan-gu/rocket,adfernandes/rkt,krnowak/rkt,jasonchaffee/rkt,luebken/rkt,lucasallan/rkt,marineam/rkt,yifan-gu/rkt,MattDees/rkt,squaremo/rkt,linki/rkt,achanda/rkt,achanda/rkt,s-urbaniak/rkt,kinvolk/rkt,crawford/rkt,jzelinskie/rkt,bsmr-go/rkt,shobhit85/rkt,squeed/rkt,squeed/rkt,joshix/rkt,fdserr/rkt,ChengTiesheng/rkt,tixxdz/rkt,rkt/rkt,squaremo/rkt,squaremo/rkt,jakon89/rkt,maquanyi/rkt,jakon89/rkt,tmrts/rkt,liubq919/rkt,ybubnov/rkt,luebken/rkt,lee212/rkt,jonboulle/rkt,dalanlan/rkt,wparad/rkt,jasonchaffee/rkt,nhlfr/rkt,mattthias/pkg-rkt,s-urbaniak/rkt,lucasallan/rkt,crawford/rkt,maquanyi/rkt,krnowak/rkt,michelangelo13/rkt,michelangelo13/rkt,markllama/rkt,mjg59/rkt,blixtra/rkt,liugenping/rkt,mike1729/rkt,wparad/rkt,achanda/rkt,jjlakis/rkt,lee212/rkt,Wilybald/rkt,shtouff/rkt,linki/rkt,jakon89/rkt,intfrr/rkt,smarvin/rkt,dalanlan/rkt,maquanyi/rkt,kbrwn/rkt,Yhgenomics/rkt,adfernandes/rkt,il9ue/rkt,alban/rkt,squeed/rkt,matthaias/rkt,rot26/rkt,liubq919/rkt,mjg59/rkt,bsmr-go/rkt,Shashwatsh/rkt,jasonchaffee/rkt,Yhgenomics/rkt,fdserr/rkt,kinvolk/rkt,dgonyeo/rkt,dgonyeo/rkt,euank/rkt,markllama/rkt,rot26/rkt,intfrr/rkt,euank/rkt,sinfomicien/rkt,tv42/rkt,endocode/rkt,Shashwatsh/rkt,blixtra/rkt,iaguis/rkt,kinvolk/rkt,ChengTiesheng/rkt,alban/rkt,mike1729/rkt,nhlfr/rkt,sgotti/rkt,krnowak/rkt,intelsdi-x/rkt,coreos/rkt,iaguis/rkt,shobhit85/rkt,il9ue/rkt,jjlakis/rkt,akshaykarle/rkt,cab105/rkt,iankronquist/rkt,mjg59/rkt,matthaias/rkt,euank/rkt,rkt/rkt,mattthias/pkg-rkt,ybubnov/rkt,joshix/rkt,jjlakis/rkt,ybubnov/rkt,marineam/rkt,sstabellini/rkt,MattDees/rkt,wparad/rkt,endocode/rkt,adfernandes/rkt,jzelinskie/rkt,matthaias/rkt,rkt/rkt,alexhersh/rkt,jzelinskie/rkt,intelsdi-x/rkt,tixxdz/rkt,kinvolk/rkt,tv42/rkt,rhvgoyal/rkt,coreos/rkt,jonboulle/rkt,mattthias/pkg-rkt,il9ue/rkt,sinfomicien/rkt,Shashwatsh/rkt,intfrr/rkt,lee212/rkt,coreos/rkt,rhvgoyal/rkt,smarvin/rkt,Wilybald/rkt,monstermunchkin/rkt,smarvin/rkt,blixtra/rkt,shtouff/rkt,luebken/rkt,tv42/rkt,markllama/rkt,Wilybald/rkt,marineam/rkt,dalanlan/rkt