[Democracy] hide misleading texts in case there is no turnout yet

Author: clangenb

app/lib/page-encointer/democracy/widgets/proposal_tile.dart

@@ -80,12 +80,17 @@ class _ProposalTileState extends State<ProposalTile> {
           ListTile(
             contentPadding: const EdgeInsets.symmetric(),
             leading: Text(widget.proposalId.toString(), style: titleSmall),
-            subtitle: Column(
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                Text('${l10n.proposalTurnout}: $turnout / $electorateSize'),
-                Text(l10n.proposalApprovalThreshold((threshold * 100).toStringAsFixed(2))),
-                passingOrFailingText(context, proposal, tally, widget.params)
+            subtitle: SizedBox(
+              // ensure constant height even for missing texts without turnout.
+              height: 60,
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text('${l10n.proposalTurnout}: $turnout / $electorateSize'),
+                  if (threshold != 0) Text(l10n.proposalApprovalThreshold((threshold * 100).toStringAsFixed(2))),
+                  if (threshold != 0) passingOrFailingText(context, proposal, tally, widget.params),
+                ],
+              ),
             ),
             trailing: voteButtonOrProposalStatus(context),
           ),