Do not try to display checksummed address for too-short/long address literals

libsolidity/ast/AST.cpp

@@ -587,5 +587,7 @@ bool Literal::passesAddressChecksum() const
 std::string Literal::getChecksummedAddress() const
 {
 	solAssert(isHexNumber(), "Expected hex number");
+	if (value().length != 42)
+		return string();
 	return dev::getChecksummedAddress(value());
 }

libsolidity/ast/AST.h

@@ -1613,7 +1613,7 @@ public:
 	bool looksLikeAddress() const;
 	/// @returns true if it passes the address checksum test.
 	bool passesAddressChecksum() const;
-	/// @returns the checksummed version of an address
+	/// @returns the checksummed version of an address (or empty string if not valid)
 	std::string getChecksummedAddress() const;
 
 private: