remark-lint-table-cell-padding: fix almost empty cells

Previously, for cells with just one character, which were properly
aligned considering that the delimiter row also holds up space,
there was an incorrect suggestion to remove spacing.

packages/remark-lint-table-cell-padding/index.js

@@ -213,11 +213,20 @@ const remarkLintTableCellPadding = lintRule(
       /* c8 ignore next */
       const align = node.align || []
       /** @type {number[]} */
-      const sizes = Array.from({length: align.length})
+      const sizes = []
       /** @type {Entry[]} */
       const entries = []
       let index = -1
 
+      // Check align row.
+      // Because there’s zero to two `:`, and there must be one `-`.
+      while (++index < align.length) {
+        const alignment = align[index]
+        sizes[index] = alignment === 'center' ? 3 : alignment ? 2 : 1
+      }
+
+      index = -1
+
       // Check rows.
       while (++index < rows.length) {
         const row = rows[index]
@@ -253,6 +262,8 @@ const remarkLintTableCellPadding = lintRule(
 
             // Detect max space per column.
             sizes[column] = Math.max(
+              // More cells could exist than the align row for generated tables.
+              /* c8 ignore next */
               sizes[column] || 0,
               contentEnd - contentStart
             )