Fixing error that occurs when an item in an Observe.List contains a comp... #419
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...ute and is removed
If an Observe.List item contains a compute that does not have any bindings, removing that item from the list results in a JS error in compute.js
This occurs when the compute does not have any bindings, so
on
is never called, leavingcomputedData === undefined
.Fix is to check that computedData is truthy before calling teardown()