[Bug]: NPE when trying to get system settings with default config.yaml

[turboFei]

What happened?

2025-11-23 16:50:22,118 ERROR [JettyServerThreadPool-91] [org.apache.amoro.server.dashboard.DashboardServer] [] - An error occurred while processing the url:http://localhost:1630/api/ams/v1/settings/system
java.lang.NullPointerException: Cannot invoke "Object.toString()" because the return value of "java.util.Map$Entry.getValue()" is null
        at org.apache.amoro.config.ConfigHelpers.lambda$convertToString$10(ConfigHelpers.java:226) ~[amoro-common-0.9-SNAPSHOT.jar:0.9-SNAPSHOT]
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
        at java.util.Iterator.forEachRemaining(Iterator.java:133) ~[?:?]
        at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845) ~[?:?]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[?:?]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?]
        at org.apache.amoro.config.ConfigHelpers.convertToString(ConfigHelpers.java:231) ~[amoro-common-0.9-SNAPSHOT.jar:0.9-SNAPSHOT]
        at org.apache.amoro.config.ConfigHelpers.lambda$convertToString$9(ConfigHelpers.java:215) ~[amoro-common-0.9-SNAPSHOT.jar:0.9-SNAPSHOT]
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[?:?]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?]
        at org.apache.amoro.config.ConfigHelpers.convertToString(ConfigHelpers.java:216) ~[amoro-common-0.9-SNAPSHOT.jar:0.9-SNAPSHOT]
        at org.apache.amoro.config.Configurations.toMap(Configurations.java:565) ~[amoro-common-0.9-SNAPSHOT.jar:0.9-SNAPSHOT]
        at org.apache.amoro.server.dashboard.controller.SettingController.getSystemSetting(SettingController.java:62) ~[amoro-ams-0.9-SNAPSHOT.jar:0.9-SNAPSHOT]

Affects Versions

master

What table formats are you seeing the problem on?

No response

What engines are you seeing the problem on?

No response

How to reproduce

No response

Relevant log output

Anything else

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct