Don't try to select unselectable row on library tree row removal

(If deleting a group, don't select the header or separator before it.)

chrome/content/zotero/xpcom/collectionTreeView.js

@@ -2364,7 +2364,7 @@ Zotero.CollectionTreeRow.prototype.getSearchObject = Zotero.Promise.coroutine(fu
 			s.addCondition('deleted', 'true');
 		}
 		else {
-			throw new Error('Invalid search mode in Zotero.CollectionTreeRow.getSearchObject()');
+			throw new Error('Invalid search mode ' + this.type);
 		}
 	}
 	

chrome/content/zotero/xpcom/libraryTreeView.js

@@ -140,9 +140,22 @@ Zotero.LibraryTreeView.prototype = {
 		if (lastRow && this.selection.isSelected(row)) {
 			// Deselect removed row
 			this.selection.toggleSelect(row);
-			// If no other rows selected, select row before
+			// If no other rows selected, select first selectable row before
 			if (this.selection.count == 0 && row !== 0) {
-				this.selection.toggleSelect(row - 1);
+				let previous = row;
+				while (true) {
+					previous--;
+					// Should ever happen
+					if (previous < 0) {
+						break;
+					}
+					if (!this.isSelectable(previous)) {
+						continue;
+					}
+					
+					this.selection.toggleSelect(previous);
+					break;
+				}
 			}
 		}
 		

test/tests/collectionTreeViewTest.js

@@ -415,9 +415,7 @@ describe("Zotero.CollectionTreeView", function() {
 			linked = yield attachment.getLinkedItem(group.libraryID);
 			assert.equal(linked.id, treeRow.ref.id);
 			
-			yield Zotero.DB.executeTransaction(function* () {
-				return group.erase();
-			})
+			return group.eraseTx();
 		})
 		
 		it("should not copy an item or its attachment to a group twice", function* () {