Remove unneeded errors

The if statements are testing whether these particular library files have already been added to the list of scripts/styles that will be included on the page, so that multiple link/script tags aren't created for the same files.

If the files have already been added by previously calling the attach function, that is entirely fine, and not an issue.

src/kalastatic.js

@@ -193,9 +193,6 @@ function addTwigAttachLibrary(renderData, config) {
         renderData.stylesheet_files.push(filename);
         renderData.kalastatic_stylesheets[0] += "<link href=\"" + renderData.base_url + "/" + filename + "\" rel=\"stylesheet\">";
       }
-      else {
-        console.error(`kalastatic: Library stylesheet file missing: ${library} ${source} expects "${filename}"`);
-      }
     }
 
     // Add any associated scripts
@@ -205,9 +202,6 @@ function addTwigAttachLibrary(renderData, config) {
         renderData.script_files.push(filename);
         renderData.kalastatic_scripts[0] += "<script src=\"" + renderData.base_url + "/" + filename + "\" ></script>";
       }
-      else {
-        console.error(`kalastatic: Library JavaScript file missing: ${library} ${source} expects "${filename}"`);
-      }
     }
   };