+ few additional check to avoid segfaults if ZIM file is not there

src/common/kiwix/reader.cpp

@@ -206,6 +206,11 @@ namespace kiwix {
   /* Get a content from a zim file */
   bool Reader::getContentByUrl(const string &urlStr, string &content, unsigned int &contentLength, string &contentType) {
     bool retVal = false;
+    content="";
+    contentType="";
+    contentLength = 0;
+
+    if (this->zimFileHandler != NULL) {
       const char *url = urlStr.c_str();
       
       /* Offset to visit the url */
@@ -282,12 +287,7 @@ namespace kiwix {
 	
 	/* Set return value */
 	retVal = true;
-    } else {
-      /* The found article is not the good one */
-      content="";
-      contentType="";
-      contentLength = 0;
-      retVal = false;
+      }
     }
     
     return retVal;