raid1 case fixes

subjects/raid1a.en.md

@@ -6,7 +6,7 @@ Write a function `Raid1a` that prints a **valid** rectangle of width `x` and of
 
 The function must draw the rectangles as in the examples.
 
-`x` and `y` will always be positive numbers.
+`x` and `y` will always be positive numbers. Otherwise, the function should print nothing.
 
 ### Expected function
 

subjects/raid1b.en.md

@@ -6,7 +6,7 @@ Write a function `Raid1b` that prints a **valid** rectangle of width `x` and of
 
 The function must draw the rectangles as in the examples.
 
-`x` and `y` will always be positive numbers.
+`x` and `y` will always be positive numbers. Otherwise, the function should print nothing.
 
 ### Expected function
 

subjects/raid1c.en.md

@@ -6,7 +6,7 @@ Write a function `Raid1c` that prints a **valid** rectangle of width `x` and of
 
 The function must draw the rectangles as in the examples.
 
-`x` and `y` will always be positive numbers.
+`x` and `y` will always be positive numbers. Otherwise, the function should print nothing.
 
 ### Expected function
 

subjects/raid1d.en.md

@@ -6,7 +6,7 @@ Write a function `Raid1d` that prints a **valid** rectangle of width `x` and of
 
 The function must draw the rectangles as in the examples.
 
-`x` and `y` will always be positive numbers.
+`x` and `y` will always be positive numbers. Otherwise, the function should print nothing.
 
 ### Expected function
 

subjects/raid1e.en.md

@@ -6,7 +6,7 @@ Write a function `Raid1e` that prints a **valid** rectangle of width `x` and of
 
 The function must draw the rectangles as in the examples.
 
-`x` and `y` will always be positive numbers.
+`x` and `y` will always be positive numbers. Otherwise, the function should print nothing.
 
 ### Expected function