Fix table row selection for applications created in older versions of Lowcoder

[nangelov-eti]

Proposed changes

We found that adding a simple check resolved the issue. When a table row contains null values, we were unable to select the row or interact with the button in that row. The root cause was that when value is null or undefined, calling Object.keys(value) tries to convert it to an object, resulting in the error: TypeError: Cannot convert undefined or null to object at Function.keys. To address this, we added a check to ensure value is neither null nor undefined before attempting to access its keys.

Please review the changes for any potential side effects, though I haven't observed any. This should enhance backwards compatibility.

This PR fixes #1332

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[FalkWolsky]

Oh! You found it. This is truly amazing and we feel very thankful that you offered this solution!