[Visualization] Fix Bug: mouse frame event crash
[Visualization] Fix Bug: mouse frame event crash

- replay:
  - 1. mouse down out of a specific area
  - 2. mouse up in the area
  - (frame not check null error)

dna2github/dna2petal,dna2github/petalJS,dna2github/dna2petal,dna2github/dna2petal,dna2github/petalJS,dna2github/petalJS