fix torch frontends: fixing a small bug in the frontend norm which wa…

…s not handling the case wherein dim !=None and ord is None.

ivy/functional/frontends/torch/linalg.py

@@ -233,6 +233,8 @@ def norm(input, ord=None, dim=None, keepdim=False, *, dtype=None, out=None):
     elif dim is None and ord is None:
         input = ivy.flatten(input)
         ret = ivy.vector_norm(input, axis=0, keepdims=keepdim, ord=2)
+    elif dim != None and ord is None:
+        ret = ivy.vector_norm(input, axis=dim, keepdims=keepdim, ord=2)
     elif isinstance(dim, int):
         ret = ivy.vector_norm(input, axis=dim, keepdims=keepdim, ord=ord)
     elif isinstance(dim, tuple) and len(dim) <= 2: