LITTLE ROCK, Ark. — A federal judge on Tuesday blocked an Arkansas law banning nearly all abortions in the state while she hears a challenge to its constitutionality.U.S. District Judge Kristine Baker issued a preliminary injunction preventing enforcement of the law, which was set to take effect on July 28. The measure was passed this year by the majority-Republican Legislature and signed by GOP Gov. Asa Hutchinson.The ban allows the procedure to save the life of the mother in a medical emergency and does not provide …