fixed issues with null values in votes map

lib/view/pages/talk/components/pollOptionsList.dart

@@ -1,5 +1,4 @@
 
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_linkify/flutter_linkify.dart';
 
@@ -16,22 +15,20 @@ class PollOptionsList extends StatefulWidget {
 class _PollOptionsListState extends State<PollOptionsList> {
   @override
   Widget build(BuildContext context) => Column(
-    mainAxisSize: MainAxisSize.min,
+      mainAxisSize: MainAxisSize.min,
       children: [
         ...widget.pollData.options.map<Widget>((option) {
           var optionId = widget.pollData.options.indexOf(option);
           var votedSelf = widget.pollData.votedSelf.contains(optionId);
-          var votes = widget.pollData.votes.runtimeType is Map<String, dynamic>
-            ? widget.pollData.votes['option-$optionId']
-            : 0;
-          int numVoters = 1;
-          if(widget.pollData.numVoters != null && widget.pollData.numVoters != 0) {
-            numVoters = widget.pollData.numVoters!;
-          }
-          var portion = (votes / numVoters);
+          var portionsVisible = widget.pollData.votes is Map<String, dynamic>;
+          var votes = !portionsVisible ? 0
+            : (widget.pollData.votes['option-$optionId'] as num?) ?? 0;
+          var numVoters = widget.pollData.numVoters ?? 0;
+          double portion = numVoters == 0 ? 0 : (votes / numVoters);
+
           return ListTile(
             enabled: false,
-            isThreeLine: true,
+            isThreeLine: portionsVisible,
             title: Text(
               option,
               style: Theme.of(context).textTheme.bodyLarge,
@@ -43,11 +40,11 @@ class _PollOptionsListState extends State<PollOptionsList> {
                   : Theme.of(context).colorScheme.onSurfaceVariant.withValues(alpha: 0.8),
             ),
             subtitle: Visibility(
-              visible: widget.pollData.numVoters != null,
+              visible: portionsVisible,
               child: Row(
                 children: [
                   Expanded(
-                    child: LinearProgressIndicator(value: portion),
+                    child: LinearProgressIndicator(value: portion.clamp(0.0, 1.0)),
                   ),
                   Container(
                     margin: const EdgeInsets.only(left: 10),
@@ -60,8 +57,8 @@ class _PollOptionsListState extends State<PollOptionsList> {
         }),
         ListTile(
           title: Linkify(
-            text: 'Zurzeit kann in dieser App leider nicht an Abstimmungen teilgenommen werden. '
-              'Um abzustimmen verwende die Webversion unter https://cloud.marianum-fulda.de',
+            text: 'Zurzeit kann in dieser App leider nicht abgestimmt werden. '
+              'Verwende dafür die Webversion unter https://cloud.marianum-fulda.de',
             style: Theme.of(context).textTheme.bodySmall,
           ),
         )