ARRAYFORMULA but only untill EMPTY cells in row - doesn't work - if-statement

Question

I'm trying to copy from one tab to another with ARRAYFORMULA.
It works. but it does copy all empty cells in a row too. I don't want that.
Here is my code:
={"Elevplan - Prosa (" & TÆLV('Formularsvar 1'!C2:C) & "/" & COUNTUNIQUE('Formularsvar 1'!C2:C) & " elever)" ;
ARRAYFORMULA(
HVIS(ER.TOM('Formularsvar 1'!C2:(TÆLV('Formularsvar 1'!C2:C))); "Tom: ";
(
'Formularsvar 1'!C2:C & char(10) &
'Formularsvar 1'!D1&" "&'Formularsvar 1'!$D$2:D&" "&
'Formularsvar 1'!E1&" "&'Formularsvar 1'!$E$2:E&" "&
'Formularsvar 1'!F1&" "&'Formularsvar 1'!$F$2:F&" "&
'Formularsvar 1'!$G$2:G& char(10)
)
)
)
}
It takes all cells in row C from tab 'Formularsvar 1' but the 10 last cells are empty.
How can I set a limit like C2:C22 when C is dynamic?
Sheet

Answer 1

={"Elevplan - Prosa ("&COUNTA('Formularsvar 1'!C2:C)&"/"&
COUNTUNIQUE('Formularsvar 1'!C2:C)&" elever)";
ARRAYFORMULA(IF(LEN('Formularsvar 1'!C2:C),
('Formularsvar 1'!C2:C&CHAR(10)&
'Formularsvar 1'!D1&" "&'Formularsvar 1'!$D$2:D&" "&
'Formularsvar 1'!E1&" "&'Formularsvar 1'!$E$2:E&" "&
'Formularsvar 1'!F1&" "&'Formularsvar 1'!$F$2:F&" "&
'Formularsvar 1'!$G$2:G&CHAR(10)), "Tom: "))}