Fixed a bunch of warnings

FoodsharingSiegen.Server/Controls/ProspectContainer.razor

@@ -5,7 +5,7 @@
 
 @{
     var divClass = $"{CssClass} pc-main";
-    if (Prospect.Complete) divClass += " complete";
+    if (Prospect is {Complete: true }) divClass += " complete";
 }
 
 <div class="@divClass">
@@ -15,12 +15,12 @@
             <a href=""><i class="fa-solid fa-pen-to-square" @onclick="() => ProspectModal.Show(Prospect)" @onclick:preventDefault></i> </a>
         }
         
-        @Prospect.Name
+        @Prospect?.Name
         <small style="font-size: .9rem; opacity: .7;">
-            <a class="invert" href="@(CurrentUser.NetworkLink)/profile/@Prospect.FsId" target="_blank">Profil öffnen</a>
+            <a class="invert" href="@(CurrentUser.NetworkLink)/profile/@Prospect?.FsId" target="_blank">Profil öffnen</a>
         </small>
     </h5>
-    <div>@Prospect.Memo</div>
+    <div>@Prospect?.Memo</div>
     <table>
 
         <InteractionRow