The Washington Post reported today that concert venue chain House of Blues may be opening an outpost in Penn Quarter in the not-too-distant future. The National Capital Revitalization Corp. inked a non-binding deal with HOB’s owner, Clear Channel Communications, to develop the property at 5th and I, NW. What does this bode for rock venues like the 9:30 Club and the Black Cat?. Ward 1 Council member Jim Graham put in his two cents, calling…