[SCRUM-56] 에러 및 로딩 대응 리팩토링 · Nexters/Mohanyang-iOS@0953911

Run Swiftlint: Projects/Core/DatabaseClient/Interface/DatabaseClientInterface.swift#L79

Force casts should be avoided (force_cast)

Run Swiftlint: Projects/Core/DatabaseClient/Interface/DatabaseClientInterface.swift#L72

Implicitly unwrapped optionals should be avoided when possible (implicitly_unwrapped_optional)

Run Swiftlint: Projects/Core/StreamListener/Sources/StreamListener.swift#L18

Don't include vertical whitespace (empty line) after opening braces (vertical_whitespace_opening_braces)

Run Swiftlint: Projects/Core/DatabaseClient/Sources/DatabaseClient.swift#L34

Force casts should be avoided (force_cast)

Run Swiftlint: Projects/Core/DatabaseClient/Sources/DatabaseClient.swift#L146

Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)

Run Swiftlint: Projects/Core/UserDefaultsClient/Tests/UserDefaultsClientTests.swift#L67

Force unwrapping should be avoided (force_unwrapping)

Run Swiftlint: Projects/Core/APIClient/Interface/APIClientInterface.swift#L29

Force casts should be avoided (force_cast)

Run Swiftlint: Projects/Core/APIClient/Sources/APIBaseRequest.swift#L16

Force unwrapping should be avoided (force_unwrapping)

Run Swiftlint: Projects/Core/APIClient/Sources/TokenInterceptor.swift#L48

Force unwrapping should be avoided (force_unwrapping)

Run Swiftlint: Projects/Core/APIClient/Sources/TokenInterceptor.swift#L43

Don't include vertical whitespace (empty line) after opening braces (vertical_whitespace_opening_braces)

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