Allow dense in sparse convert to function (calls create)

src/api/c/sparse.cpp

@@ -275,6 +275,12 @@ af_err af_sparse_convert_to(af_array *out, const af_array in,
                             const af_storage destStorage)
 {
     try {
+        // Handle dense case
+        const ArrayInfo& info = getInfo(in, false, true);
+        if(!info.isSparse()) {    // If input is dense
+            return af_create_sparse_array_from_dense(out, in, destStorage);
+        }
+
         af_array output = 0;
 
         const SparseArrayBase base = getSparseArrayBase(in);

src/backend/opencl/kernel/sparse.hpp

@@ -303,7 +303,6 @@ namespace opencl
 
             } catch (cl::Error err) {
                 CL_TO_AF_ERROR(err);
-                throw;
             }
         }