* Fixed RuntimeException

Code:
```php
<?
```

Actual result:
```
Exception in thread "main" java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException: String index out of range: 5
	at php.runtime.env.Environment.catchUncaught(Environment.java:721)
	at org.develnext.jphp.cli.CLI.checkSyntax(CLI.java:59)
	at org.develnext.jphp.cli.CLI.process(CLI.java:102)
	at org.develnext.jphp.cli.CLI.main(CLI.java:114)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 5
	at java.lang.String.substring(String.java:1907)
	at org.develnext.jphp.core.tokenizer.Tokenizer.nextToken(Tokenizer.java:639)
	at org.develnext.jphp.core.syntax.SyntaxAnalyzer.process(SyntaxAnalyzer.java:176)
	at org.develnext.jphp.core.syntax.SyntaxAnalyzer.<init>(SyntaxAnalyzer.java:124)
	at org.develnext.jphp.core.syntax.SyntaxAnalyzer.<init>(SyntaxAnalyzer.java:51)
	at org.develnext.jphp.cli.CLI.checkSyntax(CLI.java:55)
	... 2 more
```