No error thrown when st:call-template argument does not exist

[vcharpenay]

Example:

prefix : <http://example.org/>
template :main { st:call-template(<tag:unknown>) } where {}

[vcharpenay]

similar problem when variable is not bound. Should be ignored silently instead of failing.

Example:

template { ?var } # fails if ?var is 'undefined'
where {
  optional { :s :p ?var }
}