#14437 Guard against lateral without active well targets

A lateral gets its well path geometry from the parent well, and is
visualized even when it has no active well targets. Building the well
target spheres then calls setVectors() with empty arrays, which asserts.

ApplicationLibCode/ModelVisualization/RivWellPathPartMgr.cpp

@@ -928,6 +928,10 @@ void RivWellPathPartMgr::buildWellPathParts( const caf::DisplayCoordTransform* d
         {
             auto geoDef = modeledWellPath->geometryDefinition();
 
+            // A lateral gets its well path geometry from the parent well, and can have no active well targets
+            auto wellTargets = geoDef->activeWellTargets();
+            if ( wellTargets.empty() ) return;
+
             auto   sphereColor        = geoDef->sphereColor();
             double sphereRadiusFactor = geoDef->sphereRadiusFactor();
 
@@ -935,8 +939,6 @@ void RivWellPathPartMgr::buildWellPathParts( const caf::DisplayCoordTransform* d
             cvf::ref<cvf::Vec3fArray>   vecRes   = new cvf::Vec3fArray;
             cvf::ref<cvf::Color3fArray> colors   = new cvf::Color3fArray;
 
-            auto wellTargets = geoDef->activeWellTargets();
-
             size_t pointCount = wellTargets.size();
             vertices->reserve( pointCount );
             vecRes->reserve( pointCount );