diff --git a/scenes/card.gd b/scenes/card.gd
index 6f3168f..3738bff 100644
--- a/scenes/card.gd
+++ b/scenes/card.gd
@@ -102,9 +102,12 @@ func set_energy(new_energy):
 
 func set_id(new_id):
 	id = new_id
-	var texture = load("res://cards/%s.svg" % new_id)
-	if texture:
-		$Image.texture = texture
+	var art_path = "res://cards/%s.svg" % new_id
+	var file = File.new()
+	if file.file_exists(art_path):
+		var texture = load(art_path)
+		if texture:
+			$Image.texture = texture
 	
 func move_back():
 	position = _home_position
diff --git a/scenes/cursor.gd b/scenes/cursor.gd
index 7f7f641..5cc7be4 100644
--- a/scenes/cursor.gd
+++ b/scenes/cursor.gd
@@ -1,4 +1,4 @@
 extends Node2D
 
-func _process(delta):
+func _process(_delta):
 	global_position = get_global_mouse_position()
diff --git a/scenes/file_browser.gd b/scenes/file_browser.gd
index 98b543d..d1b34d7 100644
--- a/scenes/file_browser.gd
+++ b/scenes/file_browser.gd
@@ -100,8 +100,8 @@ func update():
 						#	is_visible = true		
 				#visible = is_visible				
 						
-func get_file_status(file_path, shell, idx):
-	var file_status = shell.run("git status -s '%s'" % file_path)
+func get_file_status(file_path, the_shell, idx):
+	var file_status = the_shell.run("git status -s '%s'" % file_path)
 	if file_status.length()>0:
 		match file_status[idx]:
 			"D":
diff --git a/scenes/file_browser_item.gd b/scenes/file_browser_item.gd
index ff3910c..1d5285d 100644
--- a/scenes/file_browser_item.gd
+++ b/scenes/file_browser_item.gd
@@ -54,5 +54,5 @@ func _set_status(new_status):
 	
 
 
-func _popup_menu_pressed(id):
+func _popup_menu_pressed(_id):
 	emit_signal("deleted", self)
diff --git a/scenes/repository.gd b/scenes/repository.gd
index f72ffb8..9b2b637 100644
--- a/scenes/repository.gd
+++ b/scenes/repository.gd
@@ -323,13 +323,3 @@ func _on_mouse_entered():
 
 func _on_mouse_exited():
 	mouse_inside = false
-		
-func close_all_file_browsers():
-	var all = all_objects()
-	
-	for o in objects.values():
-		if o.type == "commit":
-			o.file_browser.close()
-			o.file_browser.visible = false
-			
-
diff --git a/scenes/shell_command.gd b/scenes/shell_command.gd
index c02c4d5..7e65794 100644
--- a/scenes/shell_command.gd
+++ b/scenes/shell_command.gd
@@ -8,3 +8,7 @@ var output
 var exit_code
 var crash_on_fail = true
 var thread
+
+func _unused():
+	# This is just to suppress a warning about the signal never being emitted.
+	emit_signal("done")
diff --git a/scenes/text_editor.gd b/scenes/text_editor.gd
index 974b8d7..2018eec 100644
--- a/scenes/text_editor.gd
+++ b/scenes/text_editor.gd
@@ -16,7 +16,7 @@ func _process(_delta):
 	if _server.is_connection_available():
 		_client_connection = _server.take_connection()
 		var length = _client_connection.get_u32()
-		var filename = _client_connection.get_string(length)
+		var _filename = _client_connection.get_string(length)
 		
 		length = _client_connection.get_u32()
 		var content = _client_connection.get_string(length)