Fix NPE on social sign in #247

Job	Run time
unit_tests_artifact / tst_amq / maven_test	2m 50s
unit_tests_artifact / tst_ml / maven_test	2m 50s
unit_tests_artifact / tst_api / maven_test	4m 53s
unit_tests_artifact / tst_core / maven_test	7m 10s
unit_tests_artifact / tst_iapi / maven_test	3m 20s
unit_tests_artifact / tst_persistence / maven_test	3m 59s
unit_tests_artifact / tst_pubweb / maven_test	3m 32s
unit_tests_artifact / tst_sched / maven_test	3m 9s
unit_tests_artifact / tst_utils / maven_test	2m 47s
unit_tests_artifact / tst_web / maven_test	3m 51s
unit_tests_artifact / tst_api_common / maven_test	3m 16s
	41m 37s

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