Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

packages/gutenberg-to-portable-text/CHANGELOG.md

@@ -0,0 +1,23 @@
+# @emdash-cms/gutenberg-to-portable-text
+
+## 0.9.0
+
+## 0.8.0
+
+## 0.7.0
+
+## 0.6.0
+
+## 0.5.0
+
+## 0.4.0
+
+## 0.3.0
+
+## 0.2.0
+
+## 0.1.0
+
+### Minor Changes
+
+- [#14](https://github.com/emdash-cms/emdash/pull/14) [`755b501`](https://github.com/emdash-cms/emdash/commit/755b5017906811f97f78f4c0b5a0b62e67b52ec4) Thanks [@ascorbic](https://github.com/ascorbic)! - First beta release