Fixtable-grid fails to render if using row selection and data is not set at render about fixtable-ember HOT 2 CLOSED

@smargovsky, looking at this code a little more closely, I'd expect this forEach to be fine because visibleContent should compute to an empty array if content hasn't been set on the fixtable-grid yet. When you say "when data is not set at render time," what specifically does that mean? Can we reproduce this in a relatively simple environment (e.g., the dummy app)?

Obviously we can just not loop over visibleContent if it doesn't exist, but I wonder if this is actually caused by calling this function at the wrong point in the component lifecycle or something.

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So, attempts to reproduce this behavior in the dummy app have fabulously failed. Closing until further notice, thanks @menewman.

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