Commit 654143e

@@ -43,6 +43,8 @@ class _LineChart extends StatelessWidget {
                               default:
                                 if (snapshot.hasError) {
                                   res = Text('ERROR: ${snapshot.error}');
+                                } else if (snapshot.hasData && snapshot.data!.length < 2) {
+                                  res = const Text('not enough data to draw graph');
                                 } else {
                                   assert(snapshot.hasData);
                                   final data = snapshot.data ?? [];

@@ -39,7 +39,7 @@ class MeasurementList extends StatelessWidget {
                         }
                     );
                   } else {
-                    return const Text('Es existieren noch keine Werte');
+                    return const Text('no data');
                   }
                 }
               ),