Fix prettier bug StringIndexOutOfBoundsException on empty files (noted in #751).

Author: nedtwigg

CHANGES.md

@@ -22,6 +22,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 * fix typo in javadoc comment for SQL\_FORMATTER\_INDENT\_TYPE ([#753](https://github.com/diffplug/spotless/pull/753))
 ### Fixed
 * ktfmt v0.19+ with dropbox-style works again ([#765](https://github.com/diffplug/spotless/pull/765)).
+* prettier no longer throws errors on empty files ([#751](https://github.com/diffplug/spotless/pull/751)).
 
 ## [2.10.2] - 2020-11-16
 ### Fixed

lib/src/main/java/com/diffplug/spotless/npm/PrettierFormatterStep.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2020 DiffPlug
+ * Copyright 2016-2021 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -113,7 +113,7 @@ public PrettierFilePathPassingFormatterFunc(String prettierConfigOptions, Pretti
 
 		@Override
 		public String applyWithFile(String unix, File file) throws Exception {
-			FormattedPrinter.SYSOUT.print("formatting String '" + unix.substring(0, Math.min(50, unix.length() - 1)) + "[...]' in file '" + file + "'");
+			FormattedPrinter.SYSOUT.print("formatting String '" + unix.substring(0, Math.min(50, unix.length())) + "[...]' in file '" + file + "'");
 
 			final String prettierConfigOptionsWithFilepath = assertFilepathInConfigOptions(file);
 			return restService.format(unix, prettierConfigOptionsWithFilepath);

plugin-gradle/CHANGES.md

@@ -13,6 +13,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 ### Fixed
 * `ratchetFrom` now works with git-submodule ([#746](https://github.com/diffplug/spotless/issues/746))
 * ktfmt v0.19+ with dropbox-style works again ([#765](https://github.com/diffplug/spotless/pull/765)).
+* prettier no longer throws errors on empty files ([#751](https://github.com/diffplug/spotless/pull/751)).
 
 ## [5.8.2] - 2020-11-16
 ### Fixed

plugin-maven/CHANGES.md

@@ -15,6 +15,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 * `ratchetFrom` now works with git-submodule ([#746](https://github.com/diffplug/spotless/issues/746))
 * Fix broken test for spotlessFiles parameter on windows ([#737](https://github.com/diffplug/spotless/pull/737))
 * ktfmt v0.19+ with dropbox-style works again ([#765](https://github.com/diffplug/spotless/pull/765)).
+* prettier no longer throws errors on empty files ([#751](https://github.com/diffplug/spotless/pull/751)).
 
 ## [2.6.1] - 2020-11-16
 ### Fixed