Fix sonar bug and code smells => DONE

...tail/components/spectra-graph/spectra-graph.component.css

src/app/detail/store/detail.reducer.ts

src/app/documentation/containers/documentation.component.ts

src/app/documentation/store/documentation.reducer.ts

src/app/login/store/login.reducer.ts

src/app/metamodel/reducers/attribute.reducer.ts

src/app/metamodel/reducers/criteria.reducer.ts

src/app/metamodel/reducers/dataset.reducer.ts

src/app/metamodel/reducers/output.reducer.ts

src/app/search/containers/result.component.spec.ts

src/app/search/store/search.effects.ts

src/app/search/store/search.reducer.ts