planner: if dynamic call fails, or dereferencing data fails, break to undefined #4275
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Due to excessive nesting of blocks, the break statement wasn't breaking
out of enough of them: this would this add an element to the result set
when it should have turned into undefined.
This was the case in two conditions:
a. the dynamic lookup not finding a data function to call, and the resulting
static data lookup failing to resolve the ref; or
b. the dynamically called function returns undefined