add missing sanity check

Base/Axis/PointwiseAxis.cpp

@@ -86,6 +86,7 @@ void PointwiseAxis::clip(double lower, double upper)
     const auto end = m_coordinates.begin() + static_cast<diff_t>(findClosestIndex(upper)) + 1;
 
     m_coordinates = std::vector<double>(begin, end);
+    sanityCheck();
 }
 
 void PointwiseAxis::print(std::ostream& ostr) const