nullチェックを行いました。これで落ちる確率が減るはずです。 #80

Merged t-kume merged 1 commit into nitta-lab-2019:master from nitta-lab-2019:GroupsNullCheck on 27 Sep 2019
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src/main/java/com/example/cosmos_serversb/models/Groups.java
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src/main/java/com/example/cosmos_serversb/models/Users.java