[formatter] allow empty blocks IDEA-162000

platform/lang-impl/src/com/intellij/formatting/InitialInfoBuilder.java

@@ -343,7 +343,6 @@ public class InitialInfoBuilder {
     checkInsideFormatterOffTag(rootBlock);
 
     TextRange textRange = rootBlock.getTextRange();
-    checkRange(textRange);
 
     if (myPreviousBlock != null) {
       myPreviousBlock.setNextBlock(info);

platform/platform-tests/testSrc/com/intellij/formatting/engine/FormatterEngineTests.kt

@@ -32,16 +32,30 @@ class FormatterEngineTests : LightPlatformTestCase() {
   @Test
   fun `test simple alignment`() {
     doTest(
-"""
+      """
 [a0]fooooo [a1]foo
 [a0]go [a1]boo
 """,
-"""
+      """
 fooooo foo
 go     boo
 """)
   }
 
+  @Test
+  fun `test empty block alignment`() {
+    doTest(
+      """
+[a0]fooooo [a1]
+[a0]go [a1]boo
+""",
+      """
+fooooo 
+go     boo
+""")
+
+  }
+
 }
 
 fun doTest(before: String, expectedText: String) {