Merge branch 'Hotfix/1316-nullCheck' into 'Sprint/2021-02'

Hotfix/1316 null check

See merge request !14

src/Pid/Controllers/PidController.cs

@@ -74,10 +74,13 @@ namespace Coscine.Api.Pid.Controllers
                 placeholder["resourceName"] = resource.DisplayName;
                 pidEventArgs.Resource = resource;
             }
-            else
+            else if (project != null)
             {
                 placeholder["projectName"] = project.DisplayName;
                 pidEventArgs.Project = project;
+            } else
+            {
+                return BadRequest("No project/resource with this pid exists.");
             }
 
             _emitter.EmitPIDOwnerContact(pidEventArgs);

tools/packages.config

+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+    <package id="Cake" version="0.36.0" />
+</packages>