Model generation turned on by (set-option :produce-models true) does not work properly

[jurajsic]

For example, this formula

(set-logic QF_S)
(set-option :produce-models true)
(declare-const str1 String)
(declare-const str2 String)

(assert (= (str.++ str1 str2) "hello world"))

(check-sat)
(get-model)

leads to an exception, because it assumes that model generation is turned off, so the map that saves the model is empty.

The paramater theory_str_noodler_params::m_produce_models is probably set incorrectly in src/smt/params/theory_str_noodler_params.cpp.