Make import errors prettier and actually handle them

lib/import-export/import-from-csv.js

@@ -37,15 +37,9 @@ export default async function importCsv(csv, deleteFirst) {
     }, {})
   }
 
-  let cycleDays
-  try {
-    cycleDays = await csvParser(config)
-      .fromString(csv)
-      .on('header', validateHeaders)
-  } catch(err) {
-    // TODO
-    console.log(err)
-  }
+  const cycleDays = await csvParser(config)
+    .fromString(csv)
+    .on('header', validateHeaders)
 
   //remove symptoms where all fields are null
   putNullForEmptySymptoms(cycleDays)
@@ -72,7 +66,7 @@ function tryToCreateCycleDay(day, i) {
   try {
     db.create('CycleDay', day)
   } catch (err) {
-    const msg = `Error for line ${i + 1}(${day.date}): ${err.message}`
+    const msg = `Line ${i + 1}(${day.date}): ${err.message}`
     throw new Error(msg)
   }
 }