fix loading of 4.x sessions with a missing initial tempo section.
authornick_m <mainsbridge@gmail.com>
Wed, 15 Feb 2017 17:58:45 +0000 (04:58 +1100)
committernick_m <mainsbridge@gmail.com>
Wed, 15 Feb 2017 17:58:45 +0000 (04:58 +1100)
commit32248b755ba874eef55a59a66a94de2ee58a4ad9
treebeb2bd4a48dc3eca62c98fc080d60b97385f80c8
parent61ae00ed237adb043821622171f6b09f23f1c82d
fix loading of 4.x sessions with a missing initial tempo section.

- behaviour should match that of 4.x (move the first tempo
  to frame 0).
libs/ardour/tempo.cc