gdal test failure - gdal_api_proxy

https://travis-ci.org/OSGeo/gdal/builds/95887668

Running tests from gcore/gdal_api_proxy.py
  TEST: gdal_api_proxy_1 ... ERROR 6: tmp/byte.tif: Dataset does not support the AddBand() method.
  TEST: gdal_api_proxy_sub ... success

Test Script: gdal_api_proxy
Succeeded: 1
Failed:    0 (0 blew exceptions)
Skipped:   0
Expected fail:0
Duration:  0.07s

Found libgdal we are running against : /usr/lib/libgdal.so.2.1.0
success
  TEST: gdal_api_proxy_2 ... port = 8080
Could not bind()
ERROR 1: Could not connect
ERROR 1: Could not connect
Traceback (most recent call last):
  File "../pymod/gdaltest_python2.py", line 42, in run_func
    result = func()
  File "./gdal_api_proxy.py", line 122, in gdal_api_proxy_sub
    src_cs = src_ds.GetRasterBand(1).Checksum()
AttributeError: 'NoneType' object has no attribute 'GetRasterBand'
  TEST: gdal_api_proxy_sub ... fail (blowup)
  TEST: gdal_api_proxy_sub_clean ... success

Test Script: gdal_api_proxy
Succeeded: 1
Failed:    1 (1 blew exceptions)
Skipped:   0
Expected fail:0
Duration:  0.88s