Ohif 168 proper error handling (#111)

* Adding a better error handling for DICOMWeb getJson method

* Adding a better error handling for DICOMWeb getBulkData method

* Fixinf some typos. Using console.error to log errors

* Better error handling for DIMSE connections

* Using meteor error in StudyListSearch to better display same error in the client

* Using Meteor.Error for a better pattern. Added an error message in the study list. created connection error types to DICOMWeb connection errors

* Changing error types for server connection. Added better errors for DIMSE server on sockets

* Improving viewer response to error being throw when not finding server to display studies

* OHIF-168: adding catches clauses for retrieveStudyMetada method

* OHIF-168: fixing typo in DIMSE.js

* OHIF-168: setting the session variable  to false when starting a new studylist search

* OHIF-168: Using OHIF.log instead of console

* OHIF-168: removing parsing into string for OHIF.log in Connection.js

* OHIF-168: improving error message visibility in study viewer

Packages/ohif-study-list/client/lib/retrieveStudyMetadata.js

@@ -34,8 +34,20 @@ OHIF.studylist.retrieveStudyMetadata = (studyInstanceUid, seriesInstanceUids) =>
             console.timeEnd('retrieveStudyMetadata');
 
             if (error) {
-                OHIF.log.error(error);
-                reject(error);
+                const errorType = error.error;
+                let errorMessage = '';
+                
+                if (errorType === 'server-connection-error') {
+                    errorMessage = 'There was an error connecting to the DICOM server, please verify if it is up and running.'
+                } else if (errorType === 'server-internal-error') {
+                    errorMessage = `There was an internal error with the DICOM server getting metadeta for ${studyInstanceUid}`;
+                } else {
+                    errorMessage = `For some reason we could not retrieve the study\'s metadata for ${studyInstanceUid}.`;
+                }
+
+                OHIF.log.error(errorMessage);
+                OHIF.log.error(error.stack);
+                reject(`GetStudyMetadata: ${errorMessage}`);
                 return;
             }