Better test coverage for ProtocolLayerClientImpl

[hendrikebbers]

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👾 Description of the issue

The class ProtocolLayerClientImpl is the default implementation of the com.openelements.hedera.base.protocol.ProtocolLayerClient interface. Both classes can be found in the hedera-base module. The interface is the central facade to execute transactions on a network. Each method of the interface provides a specific functionality/service that is provided by a network. Based on that, all methods should be tested. When executing the tests of the hedera-base module the code coverage of the ProtocolLayerClientImpl class shoes that only 20 of the methods are executed by automatic tests. Only 36% of the lines of the class are executed by tests. We need to add more unit tests to test the missing methods of the ProtocolLayerClientImpl class.

📋 Step by step guide to do a contribution

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🤔 Additional informantion

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