Fix diagnostic false-positive when no CSS properties are present (#793)

Author: bradlc

packages/tailwindcss-language-service/src/diagnostics/getCssConflictDiagnostics.ts

@@ -82,9 +82,14 @@ export async function getCssConflictDiagnostics(
             return false
           }
 
+          let propertiesAreComparable = false
+
           for (let i = 0; i < otherRules.length; i++) {
             let otherRule = otherRules[i]
             let properties = getRuleProperties(otherRule)
+            if (info[i].properties.length > 0 && properties.length > 0) {
+              propertiesAreComparable = true
+            }
             if (!equal(info[i].properties, properties)) {
               return false
             }
@@ -94,6 +99,10 @@ export async function getCssConflictDiagnostics(
             }
           }
 
+          if (!propertiesAreComparable) {
+            return false
+          }
+
           return true
         })