Undo tweak error handling

Undo recently added exception capturing, does not work as expected

See merge request !22

Remove the logic that throws an error if there is a problem fetching
metadata and observations. It is currently not working as expected

Remove the logic that throws an error if there is a problem fetching
metadata and observations. It is currently not working as expected

Function provides a 'hack' that ensures that the correct phenomenon
symbols are displayed by a scatter plot's tooltip

Remove intermediate references

Tweak error handling

Tweak how exceptions are captured by the catch blocks

See merge request !21

Check the structure of the arrays of observations + metadata. Throw
errors if there is a problem fetching metadata and observations

Edit creation of y-axis chart titles

Abbreviate the 'temperature' phenomenon names before rendering on 
chart y-axis

See merge request !20

... for use in the y-axis text of charts

Move creation of the combined names + symbols array to the if/else
block

- Create a copy of the array passed in as an argument, which will be
modified in place

- Replace 'forEach' method with 'filter' method for brevity

Edit calculation of temperature difference

Tweaks and bug fixes to the logic for calculation of temperature 
difference

See merge request !19

Check the length of the correct array

Refactor the logic for creating the metadata for the temperature
difference (dT, VL-RL) of a single building into a new function

Refactor the logic for calculating the timestamps & values for the
temperature difference (dT, VL-RL) of a single building into a new
function

We were using the original VL observations array in the 'map' array
method. Updated to use the final version of VL observations array

Update logic for drop-down list

Deactivate 'draw chart' button during async task. In addition, improve 
legibilty by replacing multiple if's with 'case' statement

See merge request !18

Update logic for drop-down list

Tweak logic so that custom error messages are thrown before performing 
async tasks i.e. fetching observations and metadata

See merge request !17

Confirm that the selected drop-dowwn options are valid before fetching
the observations

Create a full title for line and column charts.

Ensure that title contains all the selected data points when
aggregation is selected. Before this fix, only the first data point
was included

Update logic for drop-down list

Improve processing logic for drop-down list (draw the appropriate 
chart based on selected options)

See merge request !16

Function uses options from drop-down list that have been selected by a
user to populate the appropriate observations and then draw the
appropriate chart

Update logic for drop-down list

Improve processing logic (non-GUI related) for drop-down list

See merge request !15

Update dynamic drop-down list

Improvements to dynamic drop-down list

See merge request !14

Update dynamic dropdown list

Add functionality for selecting multiple options from a dropdown list

See merge request !13

Add functionality to calculate min / max

Add logic for calculating the minimum and maximum observation values

See merge request !12

Plot line charts using daily minimum and monthly maximum values

Add two new aggregation type strings. Now there a four supported
aggregation type strings

These functions wrap the logic of the two functions that calculate the
minimum or maximum observation values for an interval delimited by
calendar dates as well as delimited by calendar months

Calculate the minimum and maximum of observation values for a monthly
interval

Calculate the minimum and maximum of observation values for a daily
interval