fix cholesky for 0-D array (#1584)

Co-authored-by: Anton <100830759+antonwolfy@users.noreply.github.com>

Author: vtavana

dpnp/backend/kernels/dpnp_krnl_linalg.cpp

@@ -47,6 +47,9 @@ DPCTLSyclEventRef dpnp_cholesky_c(DPCTLSyclQueueRef q_ref,
     (void)dep_event_vec_ref;
 
     DPCTLSyclEventRef event_ref = nullptr;
+    if (!data_size) {
+        return event_ref;
+    }
     sycl::queue q = *(reinterpret_cast<sycl::queue *>(q_ref));
 
     sycl::event event;

tests/test_linalg.py

@@ -60,6 +60,25 @@ def test_cholesky(array):
     assert_array_equal(expected, result)
 
 
+@pytest.mark.parametrize(
+    "shape",
+    [
+        (0, 0),
+        (3, 0, 0),
+    ],
+    ids=[
+        "(0, 0)",
+        "(3, 0, 0)",
+    ],
+)
+def test_cholesky_0D(shape):
+    a = numpy.empty(shape)
+    ia = inp.array(a)
+    result = inp.linalg.cholesky(ia)
+    expected = numpy.linalg.cholesky(a)
+    assert_array_equal(expected, result)
+
+
 @pytest.mark.parametrize(
     "arr",
     [[[1, 0, -1], [0, 1, 0], [1, 0, 1]], [[1, 2, 3], [4, 5, 6], [7, 8, 9]]],