tolerate null arguments, just return them

platform/platform-impl/src/com/intellij/application/options/ReplacePathToMacroMap.java

@@ -76,6 +76,7 @@ public class ReplacePathToMacroMap extends PathMacroMap {
   }
 
   public String substitute(String text, boolean caseSensitive) {
+    if (text == null) return null;
     for (final String path : getPathIndex()) {
       final String macro = get(path);
       text = replacePathMacro(text, path, macro, caseSensitive);

platform/platform-impl/src/com/intellij/openapi/components/ExpandMacroToPathMap.java

@@ -34,6 +34,7 @@ public class ExpandMacroToPathMap extends PathMacroMap {
   }
 
   public String substitute(String text, boolean caseSensitive) {
+    if (text == null) return null;
     for (Map.Entry<String, String> entry : entries()) {
       // when replacing macros with actual paths the replace utility may be used as always 'case-sensitive'
       // for case-insensitive file systems there will be no unnecesary toLowerCase() transforms.