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Fix NPE in addRoot/removeRoot when roots listChanged is unset (#1179) #828

Job	Run time
Client Conformance (sse-retry)	1m 21s
Client Conformance (initialize)	1m 4s
Server Conformance	1m 5s
Client Conformance (tools_call)	50s
Auth Conformance (auth/token-endpoint-auth-basic)	56s
Auth Conformance (auth/scope-retry-limit)	58s
Auth Conformance (auth/scope-omitted-when-undefined)	1m 6s
Auth Conformance (auth/metadata-var2)	42s
Auth Conformance (auth/scope-from-www-authenticate)	1m 6s
Auth Conformance (auth/metadata-var1)	56s
Auth Conformance (auth/metadata-default)	1m 1s
Auth Conformance (auth/metadata-var3)	1m 0s
Auth Conformance (auth/token-endpoint-auth-post)	49s
Auth Conformance (auth/scope-from-scopes-supported)	44s
Auth Conformance (auth/basic-cimd)	49s
Auth Conformance (auth/scope-step-up)	41s
Auth Conformance (auth/token-endpoint-auth-none)	45s
Auth Conformance (auth/pre-registration)	56s
Client Conformance (elicitation-sep1034-client-defaults)	56s
	17m 45s