matlab-scan.el:

(matlab-previous-code-line): In case of no comments, also
hand skip over whitespace charts.

tests/metest.el:
Force empty lines to have no spaces, other lines stay the same.
This will exercise bug found above.

tests/indents.m:
Fix mlint error.

matlab-scan.el

@@ -676,7 +676,10 @@ If LVL2 is nil, compute it."
 	  (matlab-scan-stat-inc 'codemiss)
 	  (beginning-of-line)
 	  (when (not (bobp))
-	    (forward-comment -100000) ;; Skip over all whitespace and comments.
+	    ;; Skip over all comments and intervening whitespace
+	    (forward-comment -100000)
+	    ;; If no comments, then also skip over these whitespace chars.
+	    (skip-chars-backward " \t\n")
 	    (setq prev (matlab-compute-line-context 1))
 	    (setcar (nthcdr mlf-previous-code lvl2) prev)))
       ;; else record a cache hit

tests/indents.m

@@ -354,4 +354,6 @@ function debug_cmd_dual ()
     
     %!!4
 
+    debug_cmd_dual(); %!!4
+    
 end

tests/metest.el

@@ -317,7 +317,9 @@
 	(goto-char (point-min))
 	(while (not (eobp))
 	  (beginning-of-line)
-	  (matlab--change-indentation 3) ;;(random 12)
+	  (if (looking-at "^\\s-*$")
+	      (matlab--change-indentation 0)
+	    (matlab--change-indentation 3)) ;;(random 13)?
 	  (forward-line 1)
 	  )
 	;; And don't delete - leave it to find for the next test.