Fix map zoom request to be valid if over max level
Fix map zoom request to be valid if over max level

The OpenLayers map does not zoom at all if you specify a zoom level that
is higher than the base map allows.

maurizi/otm-core,recklessromeo/otm-core,clever-crow-consulting/otm-core,RickMohr/otm-core,recklessromeo/otm-core,clever-crow-consulting/otm-core,RickMohr/otm-core,maurizi/otm-core,RickMohr/otm-core,maurizi/otm-core,recklessromeo/otm-core,recklessromeo/otm-core,RickMohr/otm-core,clever-crow-consulting/otm-core,clever-crow-consulting/otm-core,maurizi/otm-core