Rephrased syntaxError message for empty configurations to improve readability:

PKEuS · PKEuS · commit 084fcc936c43 · 2016-08-04T16:28:11.000+02:00
Old: Invalid number of character 'c' when these macros are defined: ''.
New: Invalid number of character 'c' when no macros are defined.
diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
@@ -7570,10 +7570,14 @@ void Tokenizer::syntaxError(const Token *tok) const
 void Tokenizer::syntaxError(const Token *tok, char c) const
 {
     printDebugOutput(0);
-    throw InternalError(tok,
-                        std::string("Invalid number of character '") + c + "' " +
-                        "when these macros are defined: '" + _configuration + "'.",
-                        InternalError::SYNTAX);
+    if (_configuration.empty())
+        throw InternalError(tok,
+                            std::string("Invalid number of character '") + c + "' when no macros are defined.",
+                            InternalError::SYNTAX);
+    else
+        throw InternalError(tok,
+                            std::string("Invalid number of character '") + c + "' when these macros are defined: '" + _configuration + "'.",
+                            InternalError::SYNTAX);
 }
 
 void Tokenizer::unhandled_macro_class_x_y(const Token *tok) const
diff --git a/samples/syntaxError/out.txt b/samples/syntaxError/out.txt
@@ -1 +1 @@
-[samples\syntaxError\bad.c:2]: (error) Invalid number of character '{' when these macros are defined: ''.
+[samples\syntaxError\bad.c:2]: (error) Invalid number of character '{' when no macros are defined.
diff --git a/test/testgarbage.cpp b/test/testgarbage.cpp
@@ -1073,7 +1073,7 @@ class TestGarbage : public TestFixture {
                 tokenizer.tokenize(istr, "test.cpp");
                 assertThrowFail(__FILE__, __LINE__);
             } catch (InternalError& e) {
-                ASSERT_EQUALS("Invalid number of character '(' when these macros are defined: ''.", e.errorMessage);
+                ASSERT_EQUALS("Invalid number of character '(' when no macros are defined.", e.errorMessage);
                 ASSERT_EQUALS("syntaxError", e.id);
                 ASSERT_EQUALS(2, e.token->linenr());
             }

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-[samples\syntaxError\bad.c:2]: (error) Invalid number of character '{' when these macros are defined: ''.`
	`1`	`+[samples\syntaxError\bad.c:2]: (error) Invalid number of character '{' when no macros are defined.`
Original file line number	Diff line number	Diff line change
`@@ -1073,7 +1073,7 @@ class TestGarbage : public TestFixture {`
`1073`	`1073`	`tokenizer.tokenize(istr, "test.cpp");`
`1074`	`1074`	`assertThrowFail(__FILE__, __LINE__);`
`1075`	`1075`	`} catch (InternalError& e) {`
`1076`		`- ASSERT_EQUALS("Invalid number of character '(' when these macros are defined: ''.", e.errorMessage);`
	`1076`	`+ ASSERT_EQUALS("Invalid number of character '(' when no macros are defined.", e.errorMessage);`
`1077`	`1077`	`ASSERT_EQUALS("syntaxError", e.id);`
`1078`	`1078`	`ASSERT_EQUALS(2, e.token->linenr());`
`1079`	`1079`	`}`