conditional erasure

include/armadillo_bits/diskio_meat.hpp

@@ -1763,7 +1763,16 @@ diskio::load_csv_ascii(Mat< std::complex<T> >& x, std::istream& f, std::string&
       std::getline(line_stream, token, ',');
       
       // remove spaces and tabs
-      token.erase(std::remove_if(token.begin(), token.end(), [](char c) { return ((c == ' ') || (c == '\t')); }), token.end());
+      if(token.length() > 0)
+        {
+        const char c_front = token.front();
+        const char c_back  = token.back();
+        
+        if( (c_front == ' ') || (c_front == '\t') || (c_back == ' ') || (c_back == '\t') )
+          {
+          token.erase(std::remove_if(token.begin(), token.end(), [](char c) { return ((c == ' ') || (c == '\t')); }), token.end());
+          }
+        }
       
       const size_t token_len = size_t( token.length() );