Storage - Added migration to clear the DB

Profile - Don't store empty visual scripts
Profile tree - Improved drag & drop

src/Artemis.Core/Models/Profile/Conditions/EventCondition.cs

@@ -140,6 +140,7 @@ public class EventCondition : CorePropertyChanged, INodeScriptCondition
 
             valueChangedNode.UpdateOutputPins(EventPath);
         }
+        Script.Save();
     }
 
     private void ReplaceStartNode(IEventConditionNode newStartNode)
@@ -270,7 +271,7 @@ public class EventCondition : CorePropertyChanged, INodeScriptCondition
 
         Script = _entity.Script != null
             ? new NodeScript<bool>($"Activate {_displayName}", $"Whether or not the event should activate the {_displayName}", _entity.Script, ProfileElement.Profile)
-            : new NodeScript<bool>($"Activate {_displayName}", $"Whether or not the event should activate the {_displayName}", ProfileElement.Profile);
+            :  new NodeScript<bool>($"Activate {_displayName}", $"Whether or not the event should activate the {_displayName}", ProfileElement.Profile);
         UpdateEventNode();
     }
 
@@ -281,8 +282,17 @@ public class EventCondition : CorePropertyChanged, INodeScriptCondition
         _entity.OverlapMode = (int) OverlapMode;
         _entity.ToggleOffMode = (int) ToggleOffMode;
 
-        Script.Save();
-        _entity.Script = Script?.Entity;
+        // If the exit node isn't connected and there are only the start- and exit node, don't save the script
+        if (!Script.ExitNodeConnected && Script.Nodes.Count() <= 2)
+        {
+            _entity.Script = null;
+        }
+        else
+        {
+            Script.Save();
+            _entity.Script = Script.Entity;
+        }
+
         EventPath?.Save();
         _entity.EventPath = EventPath?.Entity;
     }

src/Artemis.Core/Models/Profile/Conditions/StaticCondition.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using Artemis.Storage.Entities.Profile.Abstract;
 using Artemis.Storage.Entities.Profile.Conditions;
 
@@ -123,7 +124,9 @@ namespace Artemis.Core
             PlayMode = (StaticPlayMode) _entity.PlayMode;
             StopMode = (StaticStopMode) _entity.StopMode;
 
-            Script = new NodeScript<bool>($"Activate {_displayName}", $"Whether or not this {_displayName} should be active", _entity.Script, ProfileElement.Profile);
+            Script = _entity.Script != null
+                ? new NodeScript<bool>($"Activate {_displayName}", $"Whether or not this {_displayName} should be active", _entity.Script, ProfileElement.Profile)
+                : new NodeScript<bool>($"Activate {_displayName}", $"Whether or not this {_displayName} should be active", ProfileElement.Profile);
         }
 
         /// <inheritdoc />
@@ -132,8 +135,16 @@ namespace Artemis.Core
             _entity.PlayMode = (int) PlayMode;
             _entity.StopMode = (int) StopMode;
 
-            Script.Save();
-            _entity.Script = Script.Entity;
+            // If the exit node isn't connected and there is only the exit node, don't save the script
+            if (!Script.ExitNodeConnected && Script.Nodes.Count() == 1)
+            {
+                _entity.Script = null;
+            }
+            else
+            {
+                Script.Save();
+                _entity.Script = Script.Entity;
+            }
         }
 
         /// <inheritdoc />

src/Artemis.Core/Models/Profile/DataBindings/DataBinding.cs

@@ -39,7 +39,7 @@ namespace Artemis.Core
         ///     Gets the layer property this data binding targets
         /// </summary>
         public LayerProperty<TLayerProperty> LayerProperty { get; }
-        
+
         /// <inheritdoc />
         public INodeScript Script => _script;
 
@@ -204,7 +204,6 @@ namespace Artemis.Core
         /// <inheritdoc />
         public event EventHandler<DataBindingEventArgs>? DataBindingDisabled;
 
-
         #region Storage
 
         /// <inheritdoc />
@@ -231,9 +230,14 @@ namespace Artemis.Core
             if (_disposed)
                 throw new ObjectDisposedException("DataBinding");
 
-            _script.Save();
             Entity.IsEnabled = IsEnabled;
-            Entity.NodeScript = _script.Entity.Nodes.Any() ? _script.Entity : null;
+            if (_script.ExitNodeConnected || _script.Nodes.Count() > 1)
+            {
+                _script.Save();
+                Entity.NodeScript = _script.Entity;
+            }
+            else
+                Entity.NodeScript = null;
         }
 
         #endregion