fix(#497): default validity to empty object, set interaction validity before using it when updating interaction call

[dtfiedler]

The log below shows that validity can be undefined when returning from cache, resulting in the errors described in #497. Additionally, moves setting interaction validity before acccessing it below in interactionCall.update().

2024-01-26T17:56:55.903Z DEBUG [HandlerBasedContract] Cached state [
  SortKeyCacheResult {
    sortKey: '000001351346,0000000000000,b407f22dec983a4bcaf4a867605ed09aef711cb038eaa49161c7d9a4e17e1661',
    cachedValue: { state: [Object], validity: undefined, errorMessages: {} }
  },
  undefined
]