Empty parameters are being converted to empty arrays

[jeff-cardwell]

If no $modifier was passed to the function, malformed classes were generated because the empty parameter was converted to an empty array. This empty array always satisfied the isset and is_array conditions for the foreach loops that concatenate the $base_class and $blockname to the modifier.

I added a check before the $modifier value is converted to an array to prevent an empty array from being generated.

I went ahead and added a check on the $extra parameter as well, even though it does not present the same issue as it lacks a concatenation when it is being generated.

I also removed the lower is_array checks because by that point, if the parameter value is set it is an array.