fix(web/clipboard): allow writing empty string

core/src/web/clipboard.ts

@@ -22,8 +22,8 @@ export class ClipboardPluginWeb extends WebPlugin implements ClipboardPlugin {
       return Promise.reject('Clipboard API not available in this browser');
     }
 
-    if (options.string || options.url) {
-      await navigator.clipboard.writeText(options.string || options.url);
+    if (options.string !== undefined || options.url) {
+      await navigator.clipboard.writeText(options.string !== undefined ? options.string : options.url);
     } else if (options.image) {
       return Promise.reject('Setting images not supported on the web');
     }

example/src/pages/clipboard/clipboard.html

@@ -20,6 +20,9 @@
       <button (click)="clipboardSetString()" ion-button color="primary">
         Copy String
       </button>
+      <button (click)="clipboardSetEmptyString()" ion-button color="primary">
+        Copy Empty String
+      </button>
       <button (click)="clipboardSetURL()" ion-button color="primary">
         Copy URL
       </button>
@@ -31,6 +34,9 @@
       <button (click)="clipboardGetString()" ion-button color="primary">
         Paste String
       </button>
+      <button (click)="clipboardGetEmptyString()" ion-button color="primary">
+        Paste Empty String
+      </button>
       <button (click)="clipboardGetURL()" ion-button color="primary">
         Paste URL
       </button>

example/src/pages/clipboard/clipboard.ts

@@ -56,6 +56,19 @@ export class ClipboardPage {
     console.log('Got string from clipboard:', str.value);
   }
 
+  clipboardSetEmptyString() {
+    Plugins.Clipboard.write({
+      string: ""
+    });
+  }
+
+  async clipboardGetEmptyString() {
+    let str = await Plugins.Clipboard.read({
+      type: "string"
+    });
+    console.log('Got string from clipboard:', str.value);
+  }
+
   clipboardSetURL() {
     Plugins.Clipboard.write({
       url: "http://google.com/"