AK2: allow next blank line (" ") for replace_section and remove_section

- sometimes it's difficult to anchor to specific end lines due to variations across ROMs, so allow the end line to be blank " "
- note this will also remove the trailing blank line so for replacements a trailing \n should be added to maintain spacing; this should be pretty intuitive since you are including the blank line as the end line search

tools/ak2-core.sh

@@ -254,7 +254,11 @@ replace_section() {
   begin=`grep -n "$2" $1 | head -n1 | cut -d: -f1`;
   for end in `grep -n "$3" $1 | cut -d: -f1`; do
     if [ "$begin" -lt "$end" ]; then
-      sed -i "/${2//\//\\/}/,/${3//\//\\/}/d" $1;
+      if [ "$3" == " " ]; then
+        sed -i "/${2//\//\\/}/,/^\s*$/d" $1;
+      else
+        sed -i "/${2//\//\\/}/,/${3//\//\\/}/d" $1;
+      fi;
       sed -i "${begin}s;^;${4}\n;" $1;
       break;
     fi;
@@ -266,7 +270,11 @@ remove_section() {
   begin=`grep -n "$2" $1 | head -n1 | cut -d: -f1`;
   for end in `grep -n "$3" $1 | cut -d: -f1`; do
     if [ "$begin" -lt "$end" ]; then
-      sed -i "/${2//\//\\/}/,/${3//\//\\/}/d" $1;
+      if [ "$3" == " " ]; then
+        sed -i "/${2//\//\\/}/,/^\s*$/d" $1;
+      else
+        sed -i "/${2//\//\\/}/,/${3//\//\\/}/d" $1;
+      fi;
       break;
     fi;
   done;