Fix blank lines to match

Author: jakirkham

numcodecs/blosc.pyx

@@ -429,6 +429,7 @@ def decompress(source, dest=None):
         else:
             with nogil:
                 ret = blosc_decompress_ctx(source_ptr, dest_ptr, nbytes, 1)
+
     finally:
         pass
 

numcodecs/lz4.pyx

@@ -105,6 +105,7 @@ def compress(source, int acceleration=DEFAULT_ACCELERATION):
         with nogil:
             compressed_size = LZ4_compress_fast(source_ptr, dest_start, source_size, dest_size,
                                                 acceleration)
+
     finally:
         pass