0030591: Exception is raised by command "bopcheck" on the attached shape

Protection to avoid exception if number of vertices is equal to 1 was added.

src/IntPatch/IntPatch_PrmPrmIntersection.cxx

@@ -2543,6 +2543,7 @@ void IntPatch_PrmPrmIntersection::Perform (const Handle(Adaptor3d_HSurface)& Sur
                                 } 
                               }
                             }
+                            }
 
                             Standard_Integer pI = ciVpar;