1239: bugfix Index out of range

Author: SilinMykola

src/com/magento/idea/magento2uct/versioning/VersionStateManager.java

@@ -227,7 +227,7 @@ private void compute(final VersionStateIndex index) {
      */
     private String escapeFqn(final @NotNull String fqn) {
         return MagentoTypeEscapeUtil.escape(
-                fqn.trim().charAt(0) == '\\' ? fqn.trim() : '\\' + fqn.trim()
+                fqn.trim().length() > 0 && fqn.trim().charAt(0) == '\\' ? fqn.trim() : '\\' + fqn.trim()
         );
     }
 }