fix: pkg: minor fixes (imports and empty spaces)

GPy/kern/src/kern.py

@@ -3,7 +3,6 @@
 import sys
 import numpy as np
 from ...core.parameterization.parameterized import Parameterized
-from paramz.core.observable_array import ObsAr
 from paramz.caching import Cache_this
 from .kernel_slice_operations import KernCallsViaSlicerMeta
 from functools import reduce

GPy/kern/src/rbf.py

@@ -42,6 +42,7 @@ class RBF(Stationary):
 
     def dK2_drdr_diag(self):
         return -self.variance # as the diagonal of r is always filled with zeros
+    
     def __getstate__(self):
         dc = super(RBF, self).__getstate__()
         if self.useGPU: