[SMTChecker] Warn when no solver was found and there are unhandled queries.

liblangutil/ErrorReporter.h

@@ -22,6 +22,8 @@
 
 #pragma once
 
+#include <libdevcore/CommonData.h>
+
 #include <liblangutil/Exceptions.h>
 #include <liblangutil/SourceLocation.h>
 
@@ -40,6 +42,11 @@ public:
 
 	ErrorReporter& operator=(ErrorReporter const& _errorReporter);
 
+	void append(ErrorList const& _errorList)
+	{
+		m_errorList += _errorList;
+	}
+
 	void warning(std::string const& _description);
 
 	void warning(SourceLocation const& _location, std::string const& _description);