misc: remove logging of empty lines in diff as this is a common occurrence

Author: AlexanderSchultheiss

src/main/java/org/variantsync/diffdetective/variation/diff/DiffType.java

@@ -142,15 +142,10 @@ public static DiffType ofDiffLine(String line) {
             return ADD;
         } else if (line.startsWith(REM.symbol)) {
             return REM;
-        } else if (line.startsWith(NON.symbol)) {
-            return NON;
-        } else if (line.isEmpty()) {
-            // Treat empty lines as NON (i.e., unchanged) even though they are invalid in a diff, which expects at least
-            // one character (i.e., one of the diff type characters: '+', '-', or ' ').
-            // In contrast to other invalid cases handled by the 'else' branch, we log a warning instead of returning null,
-            // because empty lines may be created by certain text editors, such as Intellij's internal editor that may
-            // convert lines that only contain whitespace characters to empty lines upon save.
-            Logger.warn("parsing an empty line");
+        } else if (line.startsWith(NON.symbol) || line.isEmpty()) {
+            // Diff lines should ideally have at least one character specifying a line's type (i.e., one of the diff
+            // type characters: '+', '-', or ' '). However, this is not necessarily the case and unchanged lines may
+            // be empty. We thus treat empty lines in a diff as unchanged (i.e., NON),
             return NON;
         } else {
             return null;