implement warning about missing keys in url drops
implement warning about missing keys in url drops

tillgrallert/jekyll,x-way/jekyll,Strangehill/jekyll,yhironaka/yhironaka.github.io,alex-kovac/jekyll,x-way/jekyll,fulldecent/jekyll,alfredxing/jekyll,darwin/jekyll,xiebinhqy/jklly_china,ryanshaw/jekyll,x-way/jekyll,ZDroid/jekyll,tillgrallert/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,getandpost/jekyll.github.io,ryanshaw/jekyll,xiebinhqy/jklly_china,jekyll/jekyll,rasa2011/rasa2011.github.io,rlugojr/jekyll,tillgrallert/jekyll,gencer/jekyll,tomjohnson1492/jekyll,gencer/jekyll,x-way/jekyll,tillgrallert/jekyll,tomjohnson1492/jekyll,tomjohnson1492/jekyll,tomjohnson1492/jekyll,tomjohnson1492/jekyll,rasa2011/rasa2011.github.io,chrisfinazzo/jekyll,chrisfinazzo/jekyll,rlugojr/jekyll,jekyll/jekyll,getandpost/jekyll.github.io,Strangehill/jekyll,Strangehill/jekyll,fulldecent/jekyll,rasa2011/rasa2011.github.io,ryanshaw/jekyll,alex-kovac/jekyll,darwin/jekyll,alfredxing/jekyll,fulldecent/jekyll,darwin/jekyll,jekyll/jekyll,Strangehill/jekyll,alfredxing/jekyll,chrisfinazzo/jekyll,ZDroid/jekyll,getandpost/jekyll.github.io,darwin/jekyll,tillgrallert/jekyll,gencer/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,ryanshaw/jekyll,ZDroid/jekyll,rlugojr/jekyll,Strangehill/jekyll,xiebinhqy/jklly_china,gencer/jekyll,rlugojr/jekyll,xiebinhqy/jklly_china,alfredxing/jekyll,chrisfinazzo/jekyll,alex-kovac/jekyll,jaybe-jekyll/jekyll,jaybe-jekyll/jekyll,alex-kovac/jekyll,alex-kovac/jekyll,gencer/jekyll