fix: do not set postgres connection driver options if database_statem…

…ent_timeout is nil

lib/pact_broker/config/runtime_configuration_database_methods.rb

@@ -82,7 +82,7 @@ def postgres?
           private :postgres?
 
           def driver_options
-            if postgres?
+            if postgres? && database_statement_timeout
               { options: "-c statement_timeout=#{database_statement_timeout}s" }
             end
           end