Some small coverage fixes

Author: aylindmello

tests/edgeCaseCoverageTest.m

@@ -266,6 +266,16 @@ function testCompactColumnDisplay(testCase)
             testCase.verifyNotEmpty(output);
         end
 
+        function testDisplayKeyWithSpace(testCase)
+            yaml = "hello world: 42";
+            file = [tempname, '.yaml'];
+            testCase.addTeardown(@() delete(file));
+            writelines(yaml, file);
+            obj = readyaml(file);
+            output = evalc('disp(obj)');
+            testCase.verifySubstring(output, "hello world");
+        end
+
     end
 
     methods (Access = private)

toolbox/+matlab/+io/+config/+internal/+write/formatYAMLScalar.m

@@ -4,7 +4,7 @@
 
     arguments
         value
-        precision (1,1) double = 6
+        precision (1,1) double
     end
 
     if islogical(value)

toolbox/+matlab/+io/+config/+internal/+write/formatYAMLSequence.m

@@ -4,7 +4,7 @@
 
     arguments
         arr
-        precision (1,1) double = 6
+        precision (1,1) double
     end
 
     n = numel(arr);

toolbox/+matlab/+io/+config/+internal/@ConfigurationStorage/tryConcatenate.m

@@ -3,11 +3,6 @@
     %   Returns typed array if all values have same type, otherwise errors.
     %   Missing values coerce to NaN (double/single) or <missing> (string).
 
-    if isempty(values)
-        result = [];
-        return;
-    end
-
     inputShape = size(values);
 
     % Identify missing values