Resolve validation error caused by empty strings

libs/common/src/lib/helper.spec.ts

@@ -1,6 +1,8 @@
 import {
   extractNumberFromString,
   getNumberFormatGroup,
+  getStringOrNull,
+  getStringOrUndefined,
   isCurrency,
   isCurrencySymbol
 } from '@ghostfolio/common/helper';
@@ -139,6 +141,62 @@ describe('Helper', () => {
     });
   });
 
+  describe('Get string or null', () => {
+    it('String', () => {
+      expect(getStringOrNull('https://ghostfol.io')).toEqual(
+        'https://ghostfol.io'
+      );
+    });
+
+    it('String (with spaces)', () => {
+      expect(getStringOrNull(' https://ghostfol.io ')).toEqual(
+        'https://ghostfol.io'
+      );
+    });
+
+    it('Empty string', () => {
+      expect(getStringOrNull('')).toEqual(null);
+    });
+
+    it('Blank string', () => {
+      expect(getStringOrNull('   ')).toEqual(null);
+    });
+
+    it('Null', () => {
+      expect(getStringOrNull(null)).toEqual(null);
+    });
+
+    it('Undefined', () => {
+      expect(getStringOrNull(undefined)).toEqual(null);
+    });
+  });
+
+  describe('Get string or undefined', () => {
+    it('String', () => {
+      expect(getStringOrUndefined('de-DE')).toEqual('de-DE');
+    });
+
+    it('String (with spaces)', () => {
+      expect(getStringOrUndefined(' de-DE ')).toEqual('de-DE');
+    });
+
+    it('Empty string', () => {
+      expect(getStringOrUndefined('')).toEqual(undefined);
+    });
+
+    it('Blank string', () => {
+      expect(getStringOrUndefined('   ')).toEqual(undefined);
+    });
+
+    it('Null', () => {
+      expect(getStringOrUndefined(null)).toEqual(undefined);
+    });
+
+    it('Undefined', () => {
+      expect(getStringOrUndefined(undefined)).toEqual(undefined);
+    });
+  });
+
   describe('Is currency', () => {
     it('ISO 4217 currency code', () => {
       expect(isCurrency('USD')).toEqual(true);

libs/common/src/lib/helper.ts

@@ -398,16 +398,20 @@ export function getStartOfUtcDate(aDate: Date) {
 }
 
 export function getStringOrNull(aString: string | null | undefined) {
-  if (aString) {
+  const trimmedString = aString?.trim();
-    return aString;
+
+  if (trimmedString) {
+    return trimmedString;
   }
 
   return null;
 }
 
 export function getStringOrUndefined(aString: string | null | undefined) {
-  if (aString) {
+  const trimmedString = aString?.trim();
-    return aString;
+
+  if (trimmedString) {
+    return trimmedString;
   }
 
   return undefined;