SORMAS-Foundation#2329 - do not search for cases with empty space

Author: barnabartha

sormas-ui/src/main/java/de/symeda/sormas/ui/caze/CaseSelectionField.java

@@ -54,7 +54,7 @@ private void addFilterComponent() {
 		filterLayout.addComponent(searchField);
 
 		Button searchButton = ButtonHelper.createButton(Captions.caseSearchCase, e -> {
-			if (StringUtils.isNotEmpty(searchField.getValue())) {
+			if (StringUtils.isNotEmpty(searchField.getValue()) && StringUtils.isNotEmpty(searchField.getValue().trim())) {
 				criteria.setSourceCaseInfoLike(searchField.getValue());
 				grid.setCases(FacadeProvider.getCaseFacade().getIndexList(criteria, null, null, null));
 			} else {