Fix passing a list as parameter value in Pipeline YAML #952
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When loading a Pipeline, we check if any of the params reference another component. For instance, a Retriever instance can refer to a DocumentStore instance defined within the YAML.
This reference check throws an error in the case of a list as it tries to create a hash of it. This PR adds a validation that the parameter should be a string before checking if it references a component.
Resolves #951