Service context null pointer

[wangf1122]

Based on this PR #7556 there seems to be some bug in cmisStore where the ServiceContext was passed as null object.

The issue is not reproduceable in the 4.0 main branch due to the mechanism difference. But it's reproduceable in the 3.12 backport commit ianwallen@91795de

The null pointer avoidance is needed in order to make it work

Checklist

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[ianwallen]

@wangf1122

The following also use the same context code. So they will probably have the same issue. So they should be fixed as well.

/datastorages/jcloud/src/main/java/org/fao/geonet/api/records/attachments/JCloudStore.java
/datastorages/jcloud/src/main/java/org/fao/geonet/api/records/attachments/S3.java

[wangf1122]

@wangf1122

The following also use the same context code. So they will probably have the same issue. So they should be fixed as well.

/datastorages/jcloud/src/main/java/org/fao/geonet/api/records/attachments/JCloudStore.java /datastorages/jcloud/src/main/java/org/fao/geonet/api/records/attachments/S3.java

I fixed most of them. But here is some leftover which I am not capable to figure out

https://github.com/geonetwork/core-geonetwork/blob/523a8c7f07889ccc043ba4d1c57e5106d228e3e9/core/src/main/java/org/fao/geonet/kernel/AccessManager.java#L131C50-L131C50

core-geonetwork/core/src/main/java/org/fao/geonet/kernel/AccessManager.java

Line 293 in 523a8c7

UserSession us = context.getUserSession();

They are about context.getUserSession(); but context here is null. I am sure it will cause null pointer