Clear total records when loading new tables in students table

Pavlos Karakalidisrequested to merge
pkarakal/universis:577-result-update-tables into master

When switching tabs this clears (hides) the total records of the table and when the onDataLoad event is fired, the total number is shown again.

Peek_2021-03-12_18-02

Closes #577 (closed)

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