code: def has_calls(variant):
      """Does variant have any genotype calls?
  
      Args:
        variant: nucleus.genomics.v1.Variant.
  
      Returns:
        True if variant has one or more VariantCalls.
      """
      return bool(variant.calls)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import enum
  import itertools
  import six
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.util import ranges
  from third_party.nucleus.util import variantcall_utils
  from third_party.nucleus.util import vcf_constants
label_desc: Use image node_id 28 for calling a global function with example usage: has_calls(variant) and returns: bool