fix: NPE when add datasources from provider. #525
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…SourceProvider will return null when error occurs.
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What kind of change does this PR introduce? (check at least one)
The description of the PR:
com.baomidou.dynamic.datasource.provider.DynamicDataSourceProvider#loadDataSources可能会返回null，进而在com.baomidou.dynamic.datasource.DynamicRoutingDataSource#afterPropertiesSet中触发npe问题比如
com.baomidou.dynamic.datasource.provider.AbstractJdbcDataSourceProvider#loadDataSources的实现会在出现db异常的时候返回一个nullOther information: