ui: display multi-line maven error messages (issue #622)

src/lib/utility/text/TextAccess.cpp

@@ -75,6 +75,11 @@ unsigned int TextAccess::getLineCount() const
 	return m_lines.size();
 }
 
+bool TextAccess::isEmpty() const
+{
+	return m_lines.empty();
+}
+
 FilePath TextAccess::getFilePath() const
 {
 	return m_filePath;

src/lib/utility/text/TextAccess.h

@@ -16,6 +16,7 @@ public:
 	virtual ~TextAccess();
 
 	unsigned int getLineCount() const;
+	bool isEmpty() const;
 
 	FilePath getFilePath() const;