commit 691b6f75c18112d8462198278bb04a4d79a63d0e
Author: Tanmai Khanna <khanna.tanmai@gmail.com>
Date:   Sat Aug 29 17:12:06 2020 +0530

    Add space to blank queue if input blank is empty string

diff --git a/apertium/interchunk.cc b/apertium/interchunk.cc
index d1df32d..c8873b7 100644
--- a/apertium/interchunk.cc
+++ b/apertium/interchunk.cc
@@ -1540,7 +1540,16 @@ Interchunk::applyRule()
     {
       if(int(blank_queue.size()) < last_lword - 1)
       {
-        blank_queue.push(string(UtfConverter::toUtf8(*tmpblank[i-1])));
+        string blank_to_add = string(UtfConverter::toUtf8(*tmpblank[i-1]));
+        
+        if(!blank_to_add.empty())
+        {
+          blank_queue.push(blank_to_add);
+        }
+        else
+        {
+          blank_queue.push(" ");
+        }
       }
     }
 
diff --git a/apertium/postchunk.cc b/apertium/postchunk.cc
index d0b07d4..32ce004 100644
--- a/apertium/postchunk.cc
+++ b/apertium/postchunk.cc
@@ -1848,7 +1848,16 @@ Postchunk::applyRule()
   {
     if(i != 1)
     {
-        blank_queue.push(string(UtfConverter::toUtf8(*tmpblank[i-1])));
+      string blank_to_add = string(UtfConverter::toUtf8(*tmpblank[i-1]));
+      
+      if(!blank_to_add.empty())
+      {
+        blank_queue.push(blank_to_add);
+      }
+      else
+      {
+        blank_queue.push(" ");
+      }
     }
 
     word[i] = new InterchunkWord(UtfConverter::toUtf8(*tmpword[i-1]));
diff --git a/apertium/transfer.cc b/apertium/transfer.cc
index b25acb6..f20af4b 100644
--- a/apertium/transfer.cc
+++ b/apertium/transfer.cc
@@ -2602,7 +2602,16 @@ Transfer::applyRule()
     {
       if(int(blank_queue.size()) < last_lword - 1)
       {
-        blank_queue.push(string(UtfConverter::toUtf8(*tmpblank[i-1])));
+        string blank_to_add = string(UtfConverter::toUtf8(*tmpblank[i-1]));
+        
+        if(!blank_to_add.empty())
+        {
+          blank_queue.push(blank_to_add);
+        }
+        else
+        {
+          blank_queue.push(" ");
+        }
       }
     }