Update sparse_tensor_format.h (#886)

* Update sparse_tensor_format.h

* Update type_utils.h

Author: cliffburdick

include/matx/core/sparse_tensor_format.h

@@ -153,7 +153,9 @@ template <LvlOp o, int d, int c> class LvlExpr {
       return "d" + std::to_string(di) + " div " + std::to_string(cj);
     } else if constexpr (op == LvlOp::Mod) {
       return "d" + std::to_string(di) + " mod " + std::to_string(cj);
-    }
+    } else { // Should not happen
+      return "";
+    }     
   }
 };
 
@@ -179,7 +181,9 @@ template <typename Expr, LvlType ltype> class LvlSpec {
       return "compressed";
     } else if constexpr (ltype == LvlType::CompressedNonUnique) {
       return "compressed(non-unique)";
-    }
+    } else { // Should not happen
+      return "";
+    } 
   }
 };
 

include/matx/core/type_utils.h

@@ -1182,6 +1182,9 @@ constexpr cusparseIndexType_t MatXTypeToCuSparseIndexType() {
   if constexpr (std::is_same_v<T, index_t>) {
     return CUSPARSE_INDEX_64I;
   }
+  else { // Should not happen
+    return CUSPARSE_INDEX_32I;
+  }
 }
 
 } // end namespace detail