Infoklick - Enhance filter roundToDecimals

[maan002]

Is your feature request related to a problem? Please describe.
Sometimes a value will be either a string or a number. If the value is a string, you should be able to specify that this is correct and the value should be returned without an error message.

Describe the solution you'd like
Add a parameter to roundToDecimals to be able to specify this. The parameter should have a default value that retains the filter's previous functionality.

Example previous functionality:
{'45.32465456'|roundToDecimals(2)}
outputs: 45,32

Example new functionality:
{'Not a number'|roundToDecimals(2,1)}
outputs: 'Not a number'