Fix T93334: Amaranth fails to preview Image nodes

The operator assumed an active node. Simply add a poll to check for it.

Also increase the Blender version, 2.81 didn't even have Geometry Nodes.

amaranth/__init__.py

@@ -74,8 +74,8 @@ from amaranth.misc import (
 bl_info = {
     "name": "Amaranth Toolset",
     "author": "Pablo Vazquez, Bassam Kurdali, Sergey Sharybin, Lukas Tönne, Cesar Saez, CansecoGPC",
-    "version": (1, 0, 8),
-    "blender": (2, 81, 0),
+    "version": (1, 0, 9),
+    "blender": (3, 2, 0),
     "location": "Everywhere!",
     "description": "A collection of tools and settings to improve productivity",
     "warning": "",

amaranth/node_editor/display_image.py

@@ -26,9 +26,13 @@ image_nodes = ("CompositorNodeRLayers",
 class AMTH_NODE_OT_show_active_node_image(bpy.types.Operator):
     """Show active image node image in the image editor"""
     bl_idname = "node.show_active_node_image"
-    bl_label = "Show Active Node Node"
+    bl_label = "Preview Image from Node"
     bl_options = {"UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.active_node is not None
+
     def execute(self, context):
         return {'FINISHED'}