Fixes issue #51: Changed error message in case client ID is not provided

[Sakshi-75]

Associated Issue

Closes #51

Implemented Solution

I've added a new condition in case of error when anime list is not found due to invalid user to check if it's because the client ID has not been added and updated the error message for this scenario.

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[jmakhack]

@all-contributors please add @Sakshi-75 for code

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@jmakhack

I've put up a pull request to add @Sakshi-75! :tada:

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