Silence two warnings:

- Unhandled MULTI enum value.
 - Unused capture of this.

opm/simulators/wells/BlackoilWellModelGeneric.cpp

@@ -1516,7 +1516,7 @@ updateAndCommunicateGroupData(const int reportStepIdx,
                     break;
                 }
                 default:
-                    assert(false); //programming error
+                    throw std::logic_error("MULTI-phase injection is not supported, but was requested for well " + well->name());
                 }
                 group_target =
                     WellGroupHelpersType::getWellGroupTargetInjector(well->name(),

opm/simulators/wells/StandardWellConnections.cpp

@@ -426,7 +426,7 @@ computeDensitiesForStoppedProducer(const DensityPropertyFunctions& prop_func)
 {
     const auto np = this->well_.numPhases();
 
-    const auto modPhIx = [this, np]() {
+    const auto modPhIx = [np]() {
         auto phIx = std::vector<int>(np);
 
         for (auto p = 0*np; p < np; ++p) {