Throws exception when clearing a cached result of null

[dallonf]

When one of my patterns matches a path in the store that has a value of null, I get this error:

apollo.umd.js:1508 TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at isReference (webpack:///./~/apollo-cache-invalidation/lib/index.js?:42:17)
    at Object.findMatches (webpack:///./~/apollo-cache-invalidation/lib/index.js?:64:9)
    at Object.eval (webpack:///./~/traverse/index.js?:59:22)
    at walker (webpack:///./~/traverse/index.js?:190:22)
    at eval (webpack:///./~/traverse/index.js?:208:29)
    at Array.forEach (native)
    at forEach (webpack:///./~/traverse/index.js?:298:31)
    at walker (webpack:///./~/traverse/index.js?:203:13)
    at eval (webpack:///./~/traverse/index.js?:208:29)

Looks like the problem is that findMatches assumes that this.node is an object and not null.

[lucasconstantino]

Could you work on a pull-request?

[dallonf]

Unfortunately I don't have a lot of time right now and I was able to find a workaround that was actually probably a better choice in my particular scenario (instead of invalidating that particular part of the cache, I called writeQuery to populate it since I had the data that should go there available) Sorry :(

[lucasconstantino]

Thanks for pointing out the bug ;)