[css-grid-1] Put the baseline-determining steps back into 'main, then exception' order. #3645

Author: tabatkins

css-grid-1/Overview.bs

@@ -3639,15 +3639,7 @@ Grid Container Baselines</h3>
 
 	<ol>
 		<li>
-			If the [=grid container=] does not contain any [=grid items=],
-			the grid container has no first (last) <a>baseline set</a>,
-			and one is <a lt="synthesize baselines">synthesized</a> if needed
-			according to the rules of its <a>alignment context</a>.
-			Exit from this algorithm.
-
-		<li>
-			Otherwise,
-			find the first (last) row of the [=grid container=]
+			Find the first (last) row of the [=grid container=]
 			containing at least one [=grid item=].
 
 			If any of the [=grid items=] intersecting this row
@@ -3664,6 +3656,13 @@ Grid Container Baselines</h3>
 			If the [=grid item=] has no <a>alignment baseline</a> in the grid's inline axis,
 			then one is first <a lt="synthesize baselines">synthesized</a>
 			from its border edges.
+
+		<li>
+			If the [=grid container=] does not contain any [=grid items=],
+			the grid container has no first (last) <a>baseline set</a>,
+			and one is <a lt="synthesize baselines">synthesized</a> if needed
+			according to the rules of its <a>alignment context</a>.
+			Exit from this algorithm.
 	</ol>
 
 	<dfn export lt="grid order|grid-modified document order">Grid-modified document order (grid order)</dfn>