fix(eap): handle null attribute values

[davidtsuk]

Closes https://github.com/getsentry/eap-planning/issues/169

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
2842	1	2841	11

View the top 1 failed tests by shortest run time

tests.web.rpc.v1.test_endpoint_trace_item_table.test_endpoint_trace_item_table.TestTraceItemTable::test_sparse_aggregate

Stack Traces | 0.382s run time

Traceback (most recent call last):
  File ".../v1/test_endpoint_trace_item_table/test_endpoint_trace_item_table.py", line 2283, in test_sparse_aggregate
    assert response.column_values == [
AssertionError: assert [attribute_name: "animal_type"\nresults {\n  val_str: "bird"\n}\nresults {\n  val_str: "chicken"\n}\nresults {\n  val_str: "dog"\n}\n, attribute_name: "sum(wing.count)"\nresults {\n  val_double: 20\n}\nresults {\n  val_double: 10\n}\nresults {\n  val_double: 0\n  is_null: true\n}\n, attribute_name: "sum(bark.db)"\nresults {\n  val_double: 0\n  is_null: true\n}\nresults {\n  val_double: 0\n  is_null: true\n}\nresults {\n  val_double: 200\n}\n] == [attribute_name: "animal_type"\nresults {\n  val_str: "bird"\n}\nresults {\n  val_str: "chicken"\n}\nresults {\n  val_str: "dog"\n}\n,\n attribute_name: "sum(wing.count)"\nresults {\n  val_double: 20\n}\nresults {\n  val_double: 10\n}\nresults {\n  val_double: 0\n}\n,\n attribute_name: "sum(bark.db)"\nresults {\n  val_double: 0\n}\nresults {\n  val_double: 0\n}\nresults {\n  val_double: 200\n}\n]
  At index 1 diff: attribute_name: "sum(wing.count)"\nresults {\n  val_double: 20\n}\nresults {\n  val_double: 10\n}\nresults {\n  val_double: 0\n  is_null: true\n}\n != attribute_name: "sum(wing.count)"\nresults {\n  val_double: 20\n}\nresults {\n  val_double: 10\n}\nresults {\n  val_double: 0\n}\n
  Full diff:
    [
     attribute_name: "animal_type"
    results {
      val_str: "bird"
    }
    results {
      val_str: "chicken"
    }
    results {
      val_str: "dog"
    }
  - ,
  -  attribute_name: "sum(wing.count)"
  + , attribute_name: "sum(wing.count)"
  ? +
    results {
      val_double: 20
    }
    results {
      val_double: 10
    }
    results {
      val_double: 0
  +   is_null: true
    }
  - ,
  -  attribute_name: "sum(bark.db)"
  + , attribute_name: "sum(bark.db)"
  ? +
    results {
      val_double: 0
  +   is_null: true
    }
    results {
      val_double: 0
  +   is_null: true
    }
    results {
      val_double: 200
    }
    ,
    ]

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