fix: resolve several sentry errors (#1524)

* fix: if cannot find the next block, just stop looking

* refactor: if no block, then no decorations

* fix: if provided undefined, do not cause runtime errors

* don't touch type guards (for now)

---------

Co-authored-by: yousefed <yousefdardiry@gmail.com>

Author: nperez0111

packages/core/src/api/nodeConversions/nodeToBlock.ts

@@ -82,6 +82,7 @@ export function contentNodeToTableContent<
 
           // Only merge if the last and first content are both styled text nodes and have the same styles
           if (
+            first &&
             isStyledTextInlineContent(last) &&
             isStyledTextInlineContent(first) &&
             JSON.stringify(last.styles) === JSON.stringify(first.styles)

packages/core/src/extensions/SuggestionMenu/getDefaultSlashMenuItems.ts

@@ -20,11 +20,15 @@ function setSelectionToNextContentEditableBlock<
   I extends InlineContentSchema,
   S extends StyleSchema
 >(editor: BlockNoteEditor<BSchema, I, S>) {
-  let block = editor.getTextCursorPosition().block;
+  let block: Block<BSchema, I, S> | undefined =
+    editor.getTextCursorPosition().block;
   let contentType = editor.schema.blockSchema[block.type].content;
 
   while (contentType === "none") {
-    block = editor.getTextCursorPosition().nextBlock!;
+    block = editor.getTextCursorPosition().nextBlock;
+    if (block === undefined) {
+      return;
+    }
     contentType = editor.schema.blockSchema[block.type].content as
       | "inline"
       | "table"

packages/core/src/extensions/TableHandles/TableHandlesPlugin.ts

@@ -662,32 +662,27 @@ export class TableHandlesProsemirrorPlugin<
           }
 
           const decorations: Decoration[] = [];
-
-          if (newIndex === this.view.state.draggingState.originalIndex) {
-            return DecorationSet.create(state.doc, decorations);
-          } else if (
-            this.view.state.draggingState.draggedCellOrientation === "row" &&
-            !canRowBeDraggedInto(
-              this.view.state.block,
-              this.view.state.draggingState.originalIndex,
-              newIndex
-            )
-          ) {
-            return DecorationSet.create(state.doc, decorations);
-          } else if (
-            this.view.state.draggingState.draggedCellOrientation === "col" &&
-            !canColumnBeDraggedInto(
-              this.view.state.block,
-              this.view.state.draggingState.originalIndex,
-              newIndex
-            )
+          const { block, draggingState } = this.view.state;
+          const { originalIndex, draggedCellOrientation } = draggingState;
+
+          // Return empty decorations if:
+          // - Dragging to same position
+          // - No block exists
+          // - Row drag not allowed
+          // - Column drag not allowed
+          if (
+            newIndex === originalIndex ||
+            !block ||
+            (draggedCellOrientation === "row" &&
+              !canRowBeDraggedInto(block, originalIndex, newIndex)) ||
+            (draggedCellOrientation === "col" &&
+              !canColumnBeDraggedInto(block, originalIndex, newIndex))
           ) {
             return DecorationSet.create(state.doc, decorations);
           }
 
           // Gets the table to show the drop cursor in.
           const tableResolvedPos = state.doc.resolve(this.view.tablePos + 1);
-          const originalIndex = this.view.state.draggingState.originalIndex;
 
           if (this.view.state.draggingState.draggedCellOrientation === "row") {
             const cellsInRow = getCellsAtRowHandle(