Fix potential issues when retrieving variables with unresolvable variable values - #4299
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…able values A variable whose value cannot be resolved (e.g. a serialized value that can no longer be deserialized, or a custom variable type that fails to load its value) failed every read that returned variables, like the variable instance queries, the queries including variables and the variable REST endpoints. - The (historic) variable instance queries and the queries including variables return such a variable with a null value instead of failing, and mark it as having an unresolvable value (HasUnresolvableValue on the runtime and historic variable entities), so reading its value again returns null instead of failing again. - getVariable(s) of the RuntimeService, CmmnRuntimeService, TaskService and CmmnTaskService still fail for such a variable, as do variable access during process / case execution and case reactivation. - The variable REST endpoints read the variable instances and resolve their values when the REST response is created, so such a variable is returned with a null value and a valueUnresolvable marker (only present when true) instead of failing the whole response.
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A variable whose value cannot be resolved (e.g. a serialized value that can no longer be deserialized, or a custom variable type that fails to load its value) failed every read that returned variables, like the variable instance queries, the queries including variables and the variable REST endpoints.
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