[PATCH python v2] Fix handling of optional params in blockCopy()

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Commit 2b4bd07e0a22 (Add check for params, nparams being a dictionary)
changed the way the optional params argument is treated. If
libvirt.virDomain.blockCopy() is called without specifying params,
params is None, and the call will fail with:

    TypeError: block params must be a dictionary

This is wrong as params is defined as kwarg, breaking existing libvirt
users like oVirt. Add a check for Py_None, so we accept either a dict or
None and fail with TypeError with anything else.

Resolves: https://bugzilla.redhat.com/1687114

Signed-off-by: Nir Soffer <nsoffer@xxxxxxxxxx>
---
 libvirt-override.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libvirt-override.c b/libvirt-override.c
index 857c018..c5e2908 100644
--- a/libvirt-override.c
+++ b/libvirt-override.c
@@ -8835,11 +8835,11 @@ libvirt_virDomainBlockCopy(PyObject *self ATTRIBUTE_UNUSED,
         if (virPyDictToTypedParams(pyobj_dict, &params, &nparams,
                                    virPyDomainBlockCopyParams,
                                    VIR_N_ELEMENTS(virPyDomainBlockCopyParams)) < 0) {
             return NULL;
         }
-    } else {
+    } else if (pyobj_dict != Py_None) {
         PyErr_Format(PyExc_TypeError, "block params must be a dictionary");
         return NULL;
     }
 
     dom = (virDomainPtr) PyvirDomain_Get(pyobj_dom);
-- 
2.17.2

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