Added fallback to absolute URL on failure to resolve CSS stylesheet @imports

src/utils.rs

@@ -4,6 +4,7 @@ use self::base64::encode;
 use http::retrieve_asset;
 use regex::Regex;
 use url::{ParseError, Url};
+use std::io::{stderr, Write};
 
 lazy_static! {
     static ref HAS_PROTOCOL: Regex = Regex::new(r"^[a-z0-9]+:").unwrap();
@@ -132,7 +133,16 @@ pub fn resolve_css_imports(
                         opt_insecure,
                     ).map(|(a, _)| a),
 
-        }.unwrap_or_else(|_| EMPTY_STRING.clone());
+        }.unwrap_or_else(|e| {
+            writeln!(
+                stderr(),
+                "Warning: {}",
+                e,
+            ).unwrap();
+
+            //If failed to resolve, replace with absolute URL
+            embedded_url
+        });
 
         let replacement = format!("\"{}\"", &content);