chore: fix eslint issues

Author: NarrowsProjects

lib/public/components/Filters/RunsFilter/MagnetsFilteringModel.js

@@ -24,8 +24,7 @@ const magnetsCurrentLevelsToKey = ({ l3, dipole }) => ({ value: `${l3}kA/${dipol
 /**
  * Return the magnets current lever based on a key string
  *
- * @param {object} option string containing the current levels
- * @param {string} option.value string containing the current levels
+ * @param {object} value string containing the current levels
  * @return {MagnetsCurrentLevels}
  */
 const keyToMagnetsCurrentLevels = (value) => {
@@ -54,7 +53,7 @@ export class MagnetsFilteringModel extends ObservableBasedSelectionDropdownModel
         const [selectedOption] = this.selected;
 
         if (selectedOption === undefined) {
-            return;
+            return null;
         }
 
         return keyToMagnetsCurrentLevels(selectedOption);