Multiple Lambda Errors When Handling Only 1 Speaker

[BlakeItOut]

Reproducible Test: Mono audio with only an Agent speaker identified

Version: 0.7.7

Modifications Made:

• null checking on index.js in PCA UI code
• checking if the AgentMark or CustomerMark is set on transformPCA PCA Dashboard code

Anything Unusual:

• Mono audio
• Relatively large volume ~ 30K per day

In at least the indexing and transformation for the PCA dashboard there are references to properties that would only exist if there were at least an Agent and Customer speaker. Suggest adding null checks for if there is only 1 speaker.