make facet classes consistent between histogram and list
TransposeViewHelper: avoid looping over NULL, initialise with empty array
Facet histogram: jump back to page 1 when using the histogram facet

It seems that f:link.action’s argumentsToBeExcludedFromQueryString fails to work for all passed arguments if one of the passed arguments does not exist.

Workaround: f:if condition doing the check ourselves and removing the page argument if there is no prior facet seletion.
replace string »###term###« in Search controller by constant