Frame: add check for valid k_axis

Base/Axis/Frame.cpp

@@ -87,6 +87,7 @@ std::vector<int> Frame::allIndices(size_t i_flat) const
 
 size_t Frame::projectedIndex(size_t i_flat, size_t k_axis) const
 {
+    ASSERT(k_axis < rank());
     if (rank() == 1)
         return i_flat;
     if (rank() == 2) {