one minor tweak wrt #180

Author: cowtowncoder

Diff for: yaml/src/main/java/com/fasterxml/jackson/dataformat/yaml/YAMLGenerator.java

@@ -979,7 +979,10 @@ private boolean _valueNeedsQuoting(String name) {
         case 'N': // Null/NULL/N/No/NO
         case 'T': // True/TRUE
         case 'Y': // Y/Yes/YES
-            return MUST_QUOTE_VALUES.contains(name);
+            if (MUST_QUOTE_VALUES.contains(name)) {
+                return true;
+            }
+            break;
         }
         return _valueHasQuotableChar(name);
     }

Diff for: yaml/src/test/java/com/fasterxml/jackson/dataformat/yaml/ser/GeneratorWithMinimizeTest.java

@@ -124,10 +124,14 @@ public void testMinimizeQuotesWithStringsContainingSpecialChars() throws Excepti
         assertEquals("---\n" +
                 "key: \"a}b\"", yaml);
 
-        content = Collections.singletonMap("key", "a,b");
-        yaml = MINIM_MAPPER.writeValueAsString(content).trim();
+        yaml = MINIM_MAPPER.writeValueAsString(Collections.singletonMap("key", "a,b")).trim();
         assertEquals("---\n" +
                 "key: \"a,b\"", yaml);
+
+        // plus also some edge cases (wrt "false" etc checking
+        yaml = MINIM_MAPPER.writeValueAsString(Collections.singletonMap("key", "f:off")).trim();
+        assertEquals("---\n" +
+                "key: \"f:off\"", yaml);
     }
 
     public void testLiteralStringsMultiLine() throws Exception