Political deadlock blocks election of Lebanese president

* Geagea votes eclipsed by blank ballots * Rival Aoun says no clear consensus emerged * Politicians say presidential poll could take months (Adds details, quotes) By Laila Bassam and Dominic Evans BEIRUT, April 23 (Reuters) - Lebanese parliamentarians failed to elect a new president on Wednesday in a first round of voting deadlocked by domestic rifts and the war in Syria, which has polarised