[biplan] do not crash when no time can be found
[biplan] do not crash when no time can be found

laurent-george/weboob,sputnick-dev/weboob,sputnick-dev/weboob,nojhan/weboob-devel,RouxRC/weboob,laurent-george/weboob,nojhan/weboob-devel,willprice/weboob,willprice/weboob,nojhan/weboob-devel,RouxRC/weboob,laurent-george/weboob,sputnick-dev/weboob,RouxRC/weboob,willprice/weboob