fix empty string case (#1401)

* bio auth mac fix

* remove comment and change duration from 2 to 0

* cherry pick previous changes

* fix empty string case

* add support for path for all currency types

* disable paths on electrum and monero nodes

* undo mac auth changes

* stuff I missed

* 1 last thing

* another thing I missed

lib/src/screens/nodes/widgets/node_form.dart

@@ -96,18 +96,20 @@ class NodeForm extends StatelessWidget {
             ],
           ),
           SizedBox(height: 10.0),
-          Row(
-            children: <Widget>[
-              Expanded(
-                child: BaseTextFormField(
-                  controller: _pathController,
-                  hintText: "/path",
-                  validator: NodePathValidator(),
-                ),
-              )
-            ],
-          ),
-          SizedBox(height: 10.0),
+          if (nodeViewModel.hasPathSupport) ...[
+            Row(
+              children: <Widget>[
+                Expanded(
+                  child: BaseTextFormField(
+                    controller: _pathController,
+                    hintText: "/path",
+                    validator: NodePathValidator(),
+                  ),
+                )
+              ],
+            ),
+            SizedBox(height: 10.0),
+          ],
           Row(
             children: <Widget>[
               Expanded(

lib/src/widgets/validable_annotated_editable_text.dart

@@ -167,4 +167,4 @@ class ValidatableAnnotatedEditableTextState extends EditableTextState {
 
     return TextSpan(style: widget.style, text: text);
   }
-}
+}