It should be possible. But it is better to add a third action to open the file with okular without specifying the page number. You will also need to add conditions to each action specifying when to run. The first and second actions will only run if the custom column has a value. The third action will run if does not have a value.
Attached is modified version of the chain with the above conditions set. Note that you still have to replace all instances of #my_int_col with your custom column, including in the condition templates for all three actions.
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