Detecting hyperlinks on a binary class causes an exception.

[harawata]

Reported via AERI.

Bundle: org.eclipse.ui 3.109.0.v20170411-1742
Message: Unhandled event loop exception
Exception:
java.lang.IllegalStateException: source not specified
    at org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:821)
    at net.harawata.mybatipse.hyperlink.JavaHyperlinkDetector.detectHyperlinks(JavaHyperlinkDetector.java:105)
    at org.eclipse.ui.texteditor.HyperlinkDetectorRegistry$HyperlinkDetectorDelegate.detectHyperlinks(HyperlinkDetectorRegistry.java:78)
    at EXTERNAL.EXTERNAL(null:-1)
    at org.sf.feeling.decompiler.editor.JavaDecompilerClassFileEditor.access$1(JavaDecompilerClassFileEditor.java:604)
    at EXTERNAL.EXTERNAL(null:-1)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4213)