Initial well iterations as a special number, output it if it is valid.

opm/autodiff/BlackoilMultiSegmentModel_impl.hpp

@@ -182,7 +182,7 @@ namespace Opm {
         asImpl().assembleMassBalanceEq(state);
 
         // -------- Well equations ----------
-        IterationReport iter_report = {false, false, 0, 0};
+        IterationReport iter_report = {false, false, 0, std::numeric_limits<int>::min()};
         if ( ! wellsActive() ) {
             return iter_report;
         }